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1
Porter, Wayne C. "WEED CONTROL IN SWEET POTATOES WITH OXYFLUORFEN". HortScience 26, n.º 5 (mayo de 1991): 493b—493. http://dx.doi.org/10.21273/hortsci.26.5.493b.
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Oxyfluorfen was evaluated for weed control in sweet potatoes. In 1989, applications were made overtop transplants immediately after transplanting. The 1990 applications were made just prior to transplanting. Oxyfluorfen applied post-transplant at 0.38 lb ai/A and greater rates caused a significant reduction in crop vigor. A 1.0 lb ai/A rate of oxyfluorfen reduced crop vigor when applied pretransplant. All rates of oxyfluorfen controlled Brachiaria platyphylla, Digitaria sanguinalis, Cyperus iria, and Sesbania exaltata. Oxyfluorfen rates of 0.5 lb ai/A and greater were needed to consistently control Sida spinosa and Echinochloa crus-galli. Mollugo verticillata was controlled at all rates in 1989 but not controlled at all in 1990. Yields of all grades of sweet potato roots from plots treated with oxyfluorfen were not different from yields from plots treated with currently labeled herbicides. However, in 1989 yields from all oxyfluorfen-treated plots were lower than yields from the hoed check. In 1990, plots treated with oxyfluorfen at 0.25 or 0.38 lb ai/A had lower yields of No. 1 grade roots than the hoed check.
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Porter, Wayne C. "WEED CONTROL IN SWEET POTATOES WITH METOLACHLOR". HortScience 29, n.º 7 (julio de 1994): 726a—726. http://dx.doi.org/10.21273/hortsci.29.7.726a.
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Studies were conducted to evaluate metolachlor for weed control and crop tolerance in sweet potatoes. Metolachlor was applied posttransplant at rates of 0.5, 1.0, or 2.0 lb/A. Tank-mix combinations of metolachlor + clomazone were also evaluated. Clomazone was the standard herbicide used for comparison. Metolachlor alone or in combination with clomazone did not cause any serious reduction in sweet potato plant vigor when applied posttransplant. Metolachlor provided excellent control of Brachiaria platyphylla, Cyperus iria, Cyperus esculentus, and Amaranthus hybridus. Tank-mixes with clomazone did not improve the weed control of metolachlor alone. Yields of No. 1 and marketable roots from metolachlor treated plots were equal to or greater than yields from plots treated with clomazone.
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Motsenbocker, Carl E. y Thomas J. Monaco. "Sweet Potatoes (Ipomoea batatas) Differ in Response to Bentazon". Weed Technology 5, n.º 2 (junio de 1991): 345–50. http://dx.doi.org/10.1017/s0890037x00028219.
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Selected sweet potato clones were evaluated in greenhouse and field trials to identify clones with superior tolerance to bentazon. ‘Julian’ and NC 1519 were the most tolerant in the greenhouse. ‘Sweet Red’ exhibited foliar injury in the field, but yields were not reduced. The clone 79-BM-17 was equally tolerant in the field as Sweet Red, but in the greenhouse exhibited only intermediate tolerance. ‘Jewel,’ a widely grown commercial cultivar, was sensitive to bentazon in both the greenhouse and field. When averaged over all clones sweet potato injury increased as bentazon rate was increased from 1.1 to 2.2 kg ai ha-1, but it decreased as the season progressed. Bentazon did not reduce marketable yields at Clayton, NC. Bentazon as a split or late application at the 2.2 kg ha-1rate, reduced yields at Clinton, NC. Percent culls among bentazon treatments did not differ at either location.
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Firmani, Afni Kurnia, Subagiya Subagiya y Ato Sulistyo. "Pengaplikasian Dry Ice Untuk Pengendalian Cylas formicarius pada Ubi Ketela Rambat". Agrosains: Jurnal Penelitian Agronomi 20, n.º 2 (28 de marzo de 2018): 45. http://dx.doi.org/10.20961/agsjpa.v20i2.26344.
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Cylas formicarius is the main pest of sweet potatoes especially in storage. Damage from the pest attacks can reduce yields up to 97% and even minor damage causes sweet potatoes cannot be consumed because they taste bitter and toxic. Warehouse pest control such as C. formicarius is generally carried out by fumigation. Dry ice is a solid CO₂ that can be used as a fumigant to control warehouse pests. This study aims to determine the application of dry ice as fumigant and different storage places for C. formicaius in sweet potatoes. The variables observed C. formicarius population and mortality, weight loss, decrease in water content, level of damage to sweet potatoes and taste testing. The results showed that the population of C. formicarius in control higher than the other treatments, in the storage area in the population space C. formicarius is higher than in dark storage. Mortality in the treatment of giving dry ice reached 100% at the dose of 5g, 10g and 15g. Weight reduction and decrease in water content in sweet potatoes correlate with each other where in the control treatment changes in weight and water content are highest compared to other treatments. Storage places have no effect on weight loss and loss of water content in sweet potatoes. Taste of sweet potatoes before and after the shelf life with the dry ice application has not changed.
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Bauer, Larry L. "A Target MOTAD Analysis of Sweet Potato Marketing". Journal of Agricultural and Applied Economics 23, n.º 2 (diciembre de 1991): 123–30. http://dx.doi.org/10.1017/s0081305200018240.
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AbstractDecisions regarding when to harvest and when to sell sweet potatoes are more complex than for other crops because yields continue to increase after the crop is initially ready for harvest, and sweet potatoes can either be sold at harvest or cured and stored for later sale. The optimum marketing decision, based on expected net revenue, is dependent on yield and prices and their variability, and on costs of storage. A marketing strategy is developed using Target MOTAD and data covering 21 years.
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Mulkey, W. A. y W. B. McLemore. "EFFECT OF PLANT SPACING ON YIELD OF SELECTED SWEET POTATO CULTIVARS WITH VARIOUS PLANTING DATES." HortScience 27, n.º 11 (noviembre de 1992): 1165a—1165. http://dx.doi.org/10.21273/hortsci.27.11.1165a.
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Three sweet potato cultivars, `Beauregard', `Hernandez' and `Jewel' were transplanted at three different planting dates: June 4, June 21 and July 10, with harvest at 106, 109 and 117 days; respectively. Four in-row spacings of 22.9, 30.5, 38.1, and 45.7 cm on a 1 mm spacing between rows were used in each of the planting dates. The highest yields of U.S. No.1 grade potatoes in the cultivar `Beauregard' were produced at the 22.9 cm spacing in the first two planting dates and at 30.5 cm in the July 10 planting date. The highest yields of U.S. No.1 grade potatoes in the cultivar `Hernandez' were produced at 38.1 cm in all three planting dates. With the cultivar `Jewel' in the June 4 planting there was only a small difference in yield of U.S. No.1 potatoes at the 22.9, 30.5 and 38.1 cm spacings. In the June 21 and July 10 plantings the highest yields were produced at the 22.9 cm spacing. The 45.7 cm spacing produced the highest number of marketable roots per hill in all three cultivars.
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Sawai, J., T. Nakai y M. Shimizu. "Reducing Sugar Production in Sweet Potatoes Heated by Electromagnetic Radiation". Food Science and Technology International 15, n.º 1 (febrero de 2009): 89–95. http://dx.doi.org/10.1177/1082013208102740.
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The apparent reaction rate constant needed to generate reducing sugar was determined by heating a thin slice of sweet potato using thermal conductive heating. This value was used to predict reducing sugar production in sweet potatoes cooked by electromagnetic irradiation. The generation of reducing sugar in the thin slice was not observed at temperatures <65°C or >85°C, but it increased linearly during the early stage of heating. The Arrhenius plot had a peak of approximately 83°C, allowing determination of the values for activation energy and frequency factor. Then, using the values obtained for apparent reaction rate constant, the yields of reducing sugar in sweet potatoes cooked by infrared (IR) and microwave (MW) heating were calculated and compared with experimental data. Although the calculated values exceeded the experimental values in the early stages of electromagnetic irradiative heating, the calculated amounts of reducing sugar generally agreed with the experimental values. Moreover, when the time needed to heat the sweet potato from 65°C to 85 °C was longer than approximately 8 min, the yield of reducing sugar was maximized for both MW and IR heating. These results indicated that the yield of reducing sugar did not depend on the heat transfer mechanism and that the amount of reducing sugar produced in heat-treated sweet potatoes could be predicted.
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Roberts, Warren y Vincent Russo. "INFLUENCE OF CULTIVARS, FLOODING, AND TIME OF FLOODING ON SWEET POTATO YIELD". HortScience 26, n.º 5 (mayo de 1991): 489c—489. http://dx.doi.org/10.21273/hortsci.26.5.489c.
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Sweet potatoes are an important crop in the southern U.S. The southern U.S. is subject to heavy rainfall at any time during the production season, and soils could be flooded for days. Previous work has shown that sweet potatoes flooded just prior to harvest exhibited increased decay during curing and storage. This study was designed to determine the effects of flooding at both mid-season and late-season on sweet potato yield. Four cultivars were grown in both 1989 and 1990. Each cultivar received a control treatment (no flooding), flooding halfway through the production season, and flooding just prior to harvest. Flooding was continuous for approximately 6 days. Yield was not significantly affected by late season flooding, but mid-season flooding reduced yields of all varieties. Yield reduction due to flooding at mid-season was in excess of 35% in 1989 and in excess of 50% in 1990.
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Long, Rebecca J., Rebecca N. Brown y José A. Amador. "Growing Food with Garbage: Effects of Six Waste Amendments on Soil and Vegetable Crops". HortScience 52, n.º 6 (junio de 2017): 896–904. http://dx.doi.org/10.21273/hortsci11354-16.
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Using organic wastes as agricultural amendments is a productive alternative to disposal in landfills, providing nutrients for plant growth and carbon to build soil organic matter. Despite these benefits, a large fraction of organic waste is sent to landfills. Obstacles to the adoption of wastes as sources of plant nutrients include questions about harmful effects to crops or soils and the wastes’ ability to produce satisfactory yields. We compared six organic waste amendments with a mineral fertilizer control (CN) to determine effects on soil quality, soil fertility, crop quality, and crop yield in 2013 and 2014. Waste amendments were applied at a rate sufficient to supply 10,000 kg organic C/ha over two seasons, and mineral fertilizer was applied to control plots to provide 112 kg-N/ha/yr. The experiment was laid out in a randomized block design with four replicates and three crops: sweet corn (Zea mays L. cv. Applause, Brocade, and Montauk), butternut squash (Cucurbita moschata Duchesne cv. JWS 6823), and potatoes (Solanum tuberosum L. cv. Eva). Amendment with biosolids/yard waste cocompost (BS), dehydrated restaurant food waste (FW), gelatin manufacturing waste (GW), multisource compost (MS), paper fiber/chicken manure blend (PF), and yard waste compost (YW) did not have a negative impact on soil moisture, bulk density, electrical conductivity (EC), or the concentration of heavy metals in soil or plant tissue. Our results indicate potential uses for waste amendments including significantly raising soil pH (MS) and increasing soil organic matter [OM (YW and BS)]. The carbon-to-nitrogen ratio (C:N) of waste amendments was not a reliable predictor of soil inorganic N levels, and only some wastes increased potentially mineralizable nitrogen (PMN) levels relative to the control. Plots amended with BS, FW, and GW produced yields of sweet corn, butternut squash, and potatoes comparable with the control, whereas plots amended with YW, PF, and MS produced lower yields of sweet corn, squash, or both, although yields for potatoes were comparable with the control. In addition, the marketability of potatoes from PF plots was significantly better than that of the control in 2014. None of the wastes evaluated in this study had negative impacts on soil properties, some provided benefits to soil quality, and all produced comparable yields for at least one crop. Our results suggest that all six wastes have potential to be used as sources of plant nutrients.
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Morris, C., D. Mortley, P. Loretan, C. Bonsi y W. Hill. "EFFECT OF CHANNEL DEPTH ON YIELD OF SWEET POTATOES GROWN HYDROPONICALLY". HortScience 25, n.º 8 (agosto de 1990): 856b—856. http://dx.doi.org/10.21273/hortsci.25.8.856b.
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The potential of the sweet potato as a food source for future long-term manned space missions is being evaluated for the National Aeronautics and Space Administration's (NASA) Controlled Ecological Life Support System (CELSS) Program. Several experiments have shown that the sweet potato can be grown hydroponically. However, an evaluation of the NASA fan-shaped Biomass Production Chamber (BPC) channel was initiated to determine if channel depths influenced the yield of hydroponically grownsweet potatoes. Three channel depths were studied, 5 cm (2 in) standard NASA BPC channel, 10 cm (4 in) channel and 15 cm (6 in) channel. The experiment consisted of one replication. The results show that channel depth does effect the yield of storage roots. The 15 cm depth channel provided the most consistent yield with all channels having significantly different fresh storage root yields in the replicate.
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Chipili, Given. "Association Between Nutrition-Sensitive Agriculture and the Nutrition Status of Children Aged 6–59 Months in Rural Zambia". Current Developments in Nutrition 4, Supplement_2 (29 de mayo de 2020): 167. http://dx.doi.org/10.1093/cdn/nzaa043_018.
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Abstract Objectives To access the association between nutrition-sensitive agriculture and the nutrition status of children aged 6–59 months in rural Zambia. Methods We examined associations between crops grown in households and height-for-age (HAZ), Weight-for-age (WAZ) and weight-for-height (WHZ) Z- scores in children age 6–59 months of Kapiri-Mposhi district in the Central Province of Zambia. T-test was performed to compare means values of various indicators of nutrition status (Z-scores) for different categories of test variables. The test variables considered here were crops grown by households. Results The prevalence of Stunting, underweight and wasting was 21%, 9% and 2% respectively. There was an association between household who grew mangoes (P = 0.001 and orange-fleshed sweet potatoes (P = 0.003) and improved HAZ. Growing groundnuts was also associated with improved WAZ. Conclusions We concluded that nutrition-sensitive agriculture is likely to improve growth in children aged 6 -59 months in low-income rural communities. Funding Sources Ministry of education Zambia.
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Wees, David, Philippe Seguin y Josée Boisclair. "Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters". Canadian Journal of Plant Science 96, n.º 1 (1 de febrero de 2016): 139–47. http://dx.doi.org/10.1139/cjps-2015-0150.
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The sweet potato (Ipomoea batatas (L.) Lam.) requires a long, hot growing season to attain good yields. In a cool climate, the use of black plastic mulch to heat the soil can improve growth but cultivars, plant spacing, and harvest date must be carefully selected to optimize yields and to attain market quality standards. In this two-year study in Quebec, Canada, two sweet potato cultivars (‘Georgia Jet’ and ‘Beauregard’) were grown at four in-row spacings (15, 30, 45, and 60 cm) and harvested at three dates (mid September, late September, and early October). Cumulative growing degree-days (GDD) with base temperatures of 10°C and 15.5°C were calculated for each harvest date. ‘Georgia Jet’ had higher total and marketable yields than ‘Beauregard’. In-row spacing had no effect on yields per hectare of ‘Beauregard’ and only affected ‘Georgia Jet’ in one year of the study. Average root weight of sweet potatoes, yields per plant, and number of roots per plant increased with wider spacing. Delaying harvest by one or two weeks had little effect on ‘Beauregard’ but increased yields of ‘Georgia Jet’. GDD may be a useful predictor of optimum harvest date but a lower base temperature used to calculate GDD may be desirable with ‘Georgia Jet’ as its yields continued to increase even when growing under cool conditions of late September and early October.
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Rahmawati, N., R. Sipayung y R. Widya. "Analysis of yields quantity and quality of several sweet potatoes genotypes at different harvest ages". IOP Conference Series: Earth and Environmental Science 782, n.º 4 (1 de junio de 2021): 042047. http://dx.doi.org/10.1088/1755-1315/782/4/042047.
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Veldkamp, A. "Quantitative land evaluation of the Chuka-South area, Kenya." Netherlands Journal of Agricultural Science 36, n.º 1 (1 de febrero de 1988): 105–7. http://dx.doi.org/10.18174/njas.v36i1.16701.
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Evaluation of land in the Chuka-South area of central Kenya indicated that there was ample scope for yield increase. Calculated water-limited yield potentials for maize, sorghum, tobacco, cotton, soyabeans, cassava, sweet potatoes, potatoes, rice, Pennisetum americanum, Cajanus cajan and Vigna unguiculata were far above actual yields. Nutrient-limited yield potentials were roughly half the water-limited yield, i.e. natural soil fertility of the Chuka-South area was low. The effects on yield levels of alternative water conservation measures were evaluated for the eastern half of the area. The evaluation indicated that a fair yield increase could be expected from prolonged mulching in the area between 700 and 1000 m. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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Navarro, Josabeth, Jahdiel Salazar, James Jihoon Kang, Jason Parsons, Chu-Lin Cheng, Alexandria Castillo y Engil Isadora Pujol Pereira. "Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region". Applied and Environmental Soil Science 2020 (30 de noviembre de 2020): 1–11. http://dx.doi.org/10.1155/2020/7230595.
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South Texas is located in a subtropical semiarid climate, and due to high temperature and irregular precipitation, farmers opt to leave their fields fallow during the summer months jeopardizing overall soil health. We evaluated whether sweet potato (Ipomoea batatas) cultivation coupled with drip irrigation could restore soil biological activities compared with bare fallow. Additionally, because sweet potatoes have high demand of soil nutrients, especially potassium (K), we evaluated the nutrient supply of locally sourced soil amendments. Sweet potato was cultivated during summer 2018 in McAllen, Texas, under control (no fertilizer), NPK (synthetic fertilizer), RC (yard-waste compost), and AC (compost produced under an enhanced composting process), and biochar (gasified walnut shell at 900°C), each with three replicates. Soil amendments were applied at different amounts to result in a rate of 80 kg K ha−1. Soil biological indicators were microbial biomass phosphorous, phosphatase activity, and the rate of fluorescein diacetate hydrolysis (FDA). Available nitrogen, phosphorus, potassium, and sodium were also quantified. Aboveground biomass and storage root yield estimated sweet potato’s agronomic performance. Cultivation and irrigation stimulated soil enzyme activities and microbial biomass-phosphorous. Sweet potato yields were the highest in NPK treatment but still 2.8 times lower than variety’s potential yield. Storage root yield was inversely related to aboveground biomass, suggesting that growing conditions benefited the production of shoot versus roots. Both biochar and AC treatments stimulated FDA rates and K availability. Soil pH and sodium concentration increased in all treatments over the growing season, possibly due to river-sourced irrigation water. Together, these findings show that crop cultivation promoted soil biological activities and the maintenance of nutrient cycling, compared to bare-fallow conditions. For a better agronomic performance of sweet potato, it would be necessary to identify management practices that minimize increase in soil pH and salinity.
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Parker, Nancy Y., Thomas J. Monaco, Ross B. Leidy y Thomas J. Sheets. "Weed Control with Fluazifop and Residues in Cucurbit Crops (Cucumissp.) and Sweet Potatoes (Ipomoea batatas)". Weed Science 33, n.º 3 (mayo de 1985): 405–10. http://dx.doi.org/10.1017/s0043174500082515.
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Fluazifop {(±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acid} controlled annual grasses in cucumbers (Cucumis sativusL. ‘Calypso’ and ‘Poinsett’), cantaloupe (Cucumis meloL. ‘Edisto 47’), zucchini squash (Cucurbita pepoL. ‘Elite’), and sweet potato (Ipomoea batatasL. ‘Jewel’) when applied as single or repeated applications of 0.3 or 0.6 kg ai/ha during 1982 and 1983 in North Carolina. All crops were generally tolerant to fluazifop and yields were equal to cultivated controls in all but one experiment. Residues detected in the various crops by high-performance liquid chromatography (HPLC) decreased as time elapsed between application and harvest increased. Approximately 1 ppm (w/w) of fluazifop was detected in cucumbers at 8 days after application, but residues were below the least detectable limit (0.05 ppm) when cucumbers, squash, and cantaloupe were harvested at 18 to 29 days after application. Fluazifop concentrations were 0.06 ppm or less in sweet potatoes at 55 days after application, and no fluazifop was detected at 84 days after application. Small cucumbers (<12 cm long) had greater fluazifop residues than larger fruit (>12 cm long) 20 days following application.
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Ferreira, Marcos Aurélio M., Valter C. Andrade Junior, Altino JM Oliveira, Evander A. Ferreira, Orlando G. Brito y Lidiane R. Silva. "Physiological characterization of plant growth in sweet potato". Horticultura Brasileira 37, n.º 1 (marzo de 2019): 112–18. http://dx.doi.org/10.1590/s0102-053620190118.
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ABSTRACT This research was installed to study plant growth of sweet potato and identify the most favorable harvest time for both roots and the aboveground part (stems). The experiment was carried out at the JK campus of the Federal University of the Vale do Jequitinhonha e Mucuri, in Diamantina, MG, complete blocks at random, with four replications. Three plants in the central part of the experimental plots were collected in twelve consecutive harvests at 15-day intervals. Plants were fractionated in roots, stems, and leaves to determine the dry matter of each part. Leaf area was also measured and growth rates were calculated. Data were analyzed by means of regression. Plants reached the highest dry matter accumulation between 75 and 156 days after transplanting (DAT), which corresponded to the phase of greatest growth. Plants should be harvested between 60 and 87 DAT to achieve the highest stem yield. For the highest root yield, the harvest should be carried out 180 DAT. The period from 80 to 118 DAT was the most adequate for reaching simultaneously the highest yields for both roots and stems. Therefore, the ideal harvest time for sweet potatoes depends on the use intended for the plant and on the physiological indexes associated with it.
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Martino, Julia A., Liliana del Valle Di Feo, Mauro Paccioretti, Clara Adriana Contardi, Miguel A. Sanchez, Leandro I. Ortega y Silvina E. Pastor. "First report of Berkeleyomyces basicola (synonymous: Thielaviopsis basicola) on roots of sweet potato (Ipomoea batatas (L.) Lam) in Argentina". Revista de la Facultad de Ciencias Agrarias UNCuyo 53, n.º 1 (7 de julio de 2021): 283–87. http://dx.doi.org/10.48162/rev.39.027.
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Symptomatic sweet potato cv Arapey INIA samples were collected from a commercial production field in Colonia Molina, Guaymallén department, Mendoza province, Argentina. They showed dark rounded lesions, sometimes coalescing with white granular mycelium. Fungus was obtained from symptomatic sweet potatoes, which represented the generalized infection that affected the crop. They were seeded in PDA with streptomycin sulfate and incubated for seven days at 21°C, alternating white/black (UV400nm) light. Observations with an optical microscope revealed the presence of hyaline, not septated, cylindrical endoconidia with rounded ends. They were 8-16 μm length and 4–6 μm width. Phialides were 43-46 μm length, rounded bases (7-9 μm width) and tapering to the neck´s tip (4-6 μm width). Brown chlamydospores (aleuriospores), 9-13 μm length and 8-12 μm width, in chains of 2-8 spores were observed. For molecular identification, total genomic DNA was extracted. ITS fragment of 565 pb was amplified using ITS5/ITS4 primers and sequenced. The sequence indicated 99% identity with Berkeleyomyces basicola (synonymous: Thielaviopsis basicola). This was deposited in GenBank as (KX580957) (CBS: C430.74, Gen Bank accession number AF275482.1). This is the first report of B. basicola in sweet potato in Argentina, a potential threat to storage root yields. Highlights: Sweet potato black root rot, new disease in Argentina. First report of Berkeleyomyces basicola causing black root rot on sweet potato in Mendoza, Argentina.
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Peloquin, S. J., Georgia L. Yerk, Joanna E. Werner y Elizabeth Darmo. "Potato breeding with haploids and 2n gametes". Genome 31, n.º 2 (15 de enero de 1989): 1000–1004. http://dx.doi.org/10.1139/g89-174.
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Potato breeding methods that utilize haploids of Solanum tuberosum group Tuberosum or group Andigena and 2n gametes exploit the genetic diversity, including both valuable traits and allelic diversity, available in exotic germ plasm. Three essential components are involved: (i) the wild and cultivated 2x relatives of the cultivated 4x potato are a valuable source of genetic diversity; (ii) haploids (2n = 2x = 24) of cultivars (2n = 4x = 48) are effective in capturing diversity (germ plasm enhancement); (iii) 2n gametes, resulting from first division restitution, are an efficient method of transmitting this genetic diversity to cultivated 4x potatoes. Heterosis for total and marketable tuber yield and specific gravity occurs in 4x families from crosses between 4x cultivars and 2x haploid Tuberosum × 'Phureja' hybrids. Selected 4x clones from relatively small 4x × 2x families have been released as cultivars based on their earliness and heat tolerance in the tropics. Other 4x clones from 4x × 2x crosses, where the 2x parents were haploid – wild species hybrids, have good yield, excellent tuber type, high specific gravity, low reducing sugars, storage quality, and stress tolerance. The seedling vigor, uniformity, and large tuber yields of progeny from 4x × 2x crosses also makes this an effective breeding method for producing potatoes from true potato seed. This breeding method is also being successfully exploited in alfalfa, red clover, sweet potatoes, yams and several species of grasses, fruits, and ornamentals.Key words: potato, haploids, 2n gametes, germ plasm, allelic diversity.
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Rosmayati, Darma Bakti, Nini Rahmawati y Ridwansyah. "Efforts to increase production sweet potato as raw materials Kaya Beta Karoten flour by using compost baglog mushroom waste". ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat 5, n.º 1 (30 de mayo de 2020): 102–7. http://dx.doi.org/10.32734/abdimastalenta.v5i1.4031.
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Research-based community partnership program activities involve two partners, namely the Murti Lestari Farmer Group and Agrina Creation UKM in Helvetia Village, XI Gang Sawit Hamlet, Labuhan Deli District Deli Serdang Regency. This dedication activity is the application of the results of research that had been carried out two years earlier which was USU's Talent Grants in 2017 and 2018. The problem faced was the lack of understanding of oyster mushroom baglog waste management techniques that have the potential to pollute the environment, on the other hand the farmer group Murti Lestari also experienced difficulties in increasing the quantity and quality of sweet potato production which is also widely cultivated in this village. The low interest of farmers is also encouraged because of the low price of sweet potato products and a relatively limited shelf life. The method implemented for training and discussion, accompanied by the practice of making compost from mushroom baglog waste, the practice of preparing planting material in the form of local sweet potato clones with high beta carotene content, compost application in sweet potato cultivation, maintenance to harvesting and post-harvest process using processing equipment into sweet potato flour rich in beta carotene and various other processed food products. Activities that have been carried out are training on composting of baglog mushroom waste using compost counting machines and bioactivators introduced in this activity so that the composting process goes faster, training on technical culture of orange sweet potato cultivation by applying mushroom baglog compost, training on mushroom making mushrooms and composting Oyster mushroom cultivation using shelves made of mild steel and fogging using a sprayer. Production and quality of yields of sweet potatoes that were given compost baglog oyster mushroom waste increased compared without the provision of compost. The next crop is processed into sweet potato flour with high beta carotene content and various food products using an introduced machine, which is a sweet potato slicing machine, flour machine, macaroni making machine and equipment for making sweet potato flour based food processing products.
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M.D, Toungos, Kwaga Y.D y Zambua B.W. "YIELD MAXIMIZATION OF SWEET POTATOES (Ipomoea batatas [L.] Lam) WHITE VS RED CULTIVARS IN YOLA, ADAMAWA STATE OF NIGERIA". International Journal of Research -GRANTHAALAYAH 7, n.º 8 (31 de agosto de 2019): 250–57. http://dx.doi.org/10.29121/granthaalayah.v7.i8.2019.666.
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A Field experiment was conducted during the 2018 cropping season, at the Teaching and Research Farm of the Department of Agriculture Federal College of Education, (FCE) Yola. Yola is located in Northern Guinea Savanna Zone at latitude 9o14’ North and longitude 12o38’ East and altitude of 158m above sea level. The treatments for experiment consist of two potato cultivars (White and Red) which vines were obtained from the open market in Yola and slips prepared from previous year’s tubers. Complete Randomized Block Design (CRBD) was used and the treatments were replicated three (3) times. Both sweet and white potatoes provide similar amounts of key nutrients including protein (2g and 3g respectively), potassium and vitamin B6, all of which contribute to a well-balanced, nutrient-dense diet. It has 20.1g CHO, Starch 20.1g, Sugars 4.2g, Dietary fiber 3g, Protein 1.6g and fat 0.1g. Soups, leaves and shoots are edible, Tubers roasted in many African Countries such as Kenya, South Sudan, Liberia, Guinea and Nigeria.their increased cultivation is being encouraged in Africa where vitamin A deficiency is a serious health problem. he highest yield of 8 tones/ha-1 was recorded on the red cut vines, followed by 6 tones/ha-1 on the white cut vines. There were no significant difference on the spread/uncut vines which gave yields of 3.6 tones/ha-1 and 4.8 tones/ha-1 while significant difference were observed on the cut vines with a mean weight tuber of 6.5 and 8.1 respectively. Results in sweet potato showed that, it has a good potential to the farmers in terms of yield and income. Their increased cultivation is being encouraged in Africa where vitamin A deficiency is a serious health problem. Their differences in terms of yield between the white and the red cultivars might be due to the methods adopted for planting the vines. It is therefore recommended to cut the vines when planting in order to obtain higher yield since yield is an important factor to be considered for sweet potato production.
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Liedl*, Barbara E., John Bombardiere, Melissa L. Williams, Amanda Stowers, Christopher Postalwait y J. Mark Chatfield. "Solid Effluent from Thermophilic Anaerobic Digestion of Poultry Litter as a Potential Fertilizer". HortScience 39, n.º 4 (julio de 2004): 877B—877. http://dx.doi.org/10.21273/hortsci.39.4.877b.
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Fertilizer costs and increased awareness of non-point source pollution run-off amplify the pressures on farm economics. Intensive farming operations provided the impetus for our study using effluent from anaerobic thermophilically digested poultry litter as a potential fertilizer. Five fertilizer treatments were used: unfertilized control, pelletized municipal sludge, commercial crop specific products, 1x digested solids and 2x digested solids. All four applications of fertilizer were equalized for nitrogen based on commercial product recommendations. Beds treated with 2x solids accumulated higher percentage of organic matter over the 5-year period. A statistically significant increase in phosphorus was found in the solids beds in 2003. Beds with 2x solids showed statistical significance for Mg, Zn and Cu. Fertilizer trials included blueberries, tomatoes, potatoes, and sweet corn. Potato fresh weight was not significantly different in 2002 or 2003, but was in 2001. Tomato fruit number was not significantly different in 2001 or 2003, but was in 2002. Tomato fresh weight for 2x solids was not significantly different from the commercial or pelletized sludge treatments in 2002 and 2003 suggesting that tomato may discriminate between treatments. Commercial and pelletized sludge fertilizers were statistically better for sweet corn fresh ear weight and number of ears in 2002 and 2003. Blueberry yields were not significantly different between treatments for any year. As this is a perennial crop, it may be several years before a significant difference is observed. While not a total solution, our research shows the effectiveness of digested poultry litter as part of a nutrient management program; making livestock residuals a nutrient resource which offers the potential for organic use.
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Mulyadi, Mulyadi, Niken Ayu Pamukas, Adelina Adelina, Iesje Lukistyowati y Dessy Yoswati. "Pelatihan budidaya ikan lele pada kolam terpal dengan sistem akuaponik di Desa Harapan, Kecamatan Sungai Apit, Kabupaten Siak, Provinsi Riau". Unri Conference Series: Community Engagement 1 (23 de septiembre de 2019): 347–54. http://dx.doi.org/10.31258/unricsce.1.347-354.
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Most of the Kampung Harapan residents are farmers, namely farming corn, sweet potatoes, chilli, fruit, vegetables (such as spinach and kale) and fish farming. This village is prospective to be used as rearing sites for aquaponic systems. Aquaponic cultivation technology can be developed in limited area and water, and it also can increase business efficiency through the utilization of nutrients from the uneaten fish meal and the metabolism wastes of fish for vegetables, so it could be able to produce fish and vegetables optimally on narrow land and limited water sources, including in urban areas. Through the fish rearing with aquaponic systems, fish farmers will get two advantages in one production stage. This activity was carried out through discussion and practice, which the activity took place in the village office and in the home yard of the fish farmer group in Harapan Village. Extension activities involve fish farmers, plantation farmers and several students. The results of the activities showed that skills and knowledge of fish farmers increase regarding aquaponics fish farming and making pellets mix with gingger. Plastic fish ponds as a pilot project produce high yields of catfish and leafy vegetables, so it can be an alternative income for fish farmers.
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Lourenço, Adriano Mendes, Aline Torquato Tavares, Tiago Alves Ferreira, Danilo Alves da Silva Porto Lopes, João Victor Gonçalves Carline, Valéria Gomes Momenté y Ildon Rodrigues Do Nascimento. "POTENCIAL DE CLONES EXPERIMENTAIS DE BATATA-DOCE PARA PRODUÇÃO DE ETANOL". Nativa 6, n.º 4 (18 de julio de 2018): 352. http://dx.doi.org/10.31413/nativa.v6i4.5613.
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A batata-doce (Ipomoea batatas (L.) Lam.) tem sido reportada como uma das espécies de planta com grande capacidade de converter biomassa em matéria prima para produção de etanol. O objetivo do trabalho foi avaliar o potencial de clones de batata-doce para produção de etanol. Foram avaliados 60 clones de batata-doce para produtividade de raízes, teor de amido nas raízes, produtividade de amido, coloração da casca e da polpa e o rendimento de etanol. O clone BDTO#122,32 e as cultivares Ana Clara e Carolina Vitória com média de 46,77; 42,75 e 41,25 t ha-¹, respectivamente, foram os que mais conseguiram acumular biomassa na forma de raiz. Os clones que apresentam as maiores médias de produtividade de amido por hectare foram BDTO#144.22 e BDTO#100.23, com valores de 15,46 e 14,16% t ha-1, com rendimentos de etanol de 8,33 e 7,63 m³ ha-¹. Os clones BDTO#144.22 e BDTO#100.23 apresentaram as maiores médias de produtividade de amido por hectare e rendimento de etanol, sendo, portanto, os mais promissores para a produção de etanol.Palavras-chave: Ipomoea batatas (L.) Lam, melhoramento genético, seleção, biocombustível. POTENTIAL OF EXPERIMENTAL CLONES OF SWEET POTATO FOR ETHANOL PRODUCTION ABSTRACT:Sweet potato (Ipomoea batatas (L.) Lam.) Has been reported as one of the plant species with great ability to convert biomass into feedstock for ethanol production. The objective of this work was to evaluate the potential of sweet potato clones for ethanol production. Twenty-six sweet potato clones were evaluated for root productivity, root starch content, starch yield, bark and pulp color, and ethanol yield. Clone BDTO # 122.32 and cultivars Ana Clara and Carolina Vitória averaging 46.77; 42.75 and 41.25 t ha-1, respectively, were the ones that were able to accumulate biomass in the root form. The clones presenting the highest starch productivity per hectare were BDTO # 144.22 and BDTO # 100.23, with values of 15.46 and 14.16% t ha-1, with ethanol yields of 8.33 and 7.63 m³ ha-¹. The clones BDTO # 144.22 and BDTO # 100.23 showed the highest averages of starch productivity per hectare and yield of ethanol, thus being the most promising for the production of ethanol.Keywords: Ipomoea potatoes (L.) Lam, breeding, selection, biofuel.
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Siwela, Muthulisi, Kirthee Pillay, Laurencia Govender, Shenelle Lottering, Fhatuwani N. Mudau, Albert T. Modi y Tafadzwanashe Mabhaudhi. "Biofortified Crops for Combating Hidden Hunger in South Africa: Availability, Acceptability, Micronutrient Retention and Bioavailability". Foods 9, n.º 6 (21 de junio de 2020): 815. http://dx.doi.org/10.3390/foods9060815.
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In many poorer parts of the world, biofortification is a strategy that increases the concentration of target nutrients in staple food crops, mainly by genetic manipulation, to alleviate prevalent nutrient deficiencies. We reviewed the (i) prevalence of vitamin A, iron (Fe) and zinc (Zn) deficiencies; (ii) availability of vitamin A, iron and Zn biofortified crops, and their acceptability in South Africa. The incidence of vitamin A and iron deficiency among children below five years old is 43.6% and 11%, respectively, while the risk of Zn deficiency is 45.3% among children aged 1 to 9 years. Despite several strategies being implemented to address the problem, including supplementation and commercial fortification, the prevalence of micronutrient deficiencies is still high. Biofortification has resulted in the large-scale availability of βcarotene-rich orange-fleshed sweet potatoes (OFSP), while provitamin A biofortified maize and Zn and/or iron biofortified common beans are at development stages. Agronomic biofortification is being investigated to enhance yields and concentrations of target nutrients in crops grown in agriculturally marginal environments. The consumer acceptability of OFSP and provitamin A biofortified maize were higher among children compared to adults. Accelerating the development of other biofortified staple crops to increase their availability, especially to the target population groups, is essential. Nutrition education should be integrated with community health programmes to improve the consumption of the biofortified crops, coupled with further research to develop suitable recipes/formulations for biofortified foods.
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Momanyi, Kennedy Moseti, James Wanjohi Muthomi y John Wangai Kimenju. "Fusarium Wilt of Banana in Kisii County, Kenya." Current Agriculture Research Journal 9, n.º 1 (31 de mayo de 2021): 16–26. http://dx.doi.org/10.12944/carj.9.1.03.
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Banana categorized as third in world’s key starch crops after cassava and sweet potatoes and it is the fourth most widely grown crop after rice, wheat and maize. The crop accounts for over 70 % of farmer’s earnings in Kisii county of Kenya. Farmers growing the crop are facing several challenges including depletion of soil fertility, low yields and diseases especially Fusarium wilt caused by Fusarium oxysporum f.sp. cubense (Foc). A study was conducted to determine the status of this disease in Kisii County. Ten farms were sampled in each Agro-ecological zone and in each farm four symptomatic and four non-symptomatic mats were sampled. Incidence was determined by relating banana seedlings affected and the total number of banana seedlings planted while severity was determined by measuring the extent of the damage/brown discoloration of the stem in length. Banana roots and pseudostem cuttings that were infected with the disease were used for isolation of the pathogen.Fusarium wilt is common in banana producing regions of Kisii County, however, the management practices are poor and do not meet the required strategies for controlling the disease. It was established that only; wood-ash and poultry manure were used by a few farmers in managing this disease. Present report is an attempt to improve the understanding of distribution and diversity of Foc in banana producing regions of Kisii County thereby aiding formulation of appropriate mitigation measures which the farmers can adopt locally.
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Остонакулов, Т. Э. y А. А. Шамсиев. "Varieties of sweet potato and features of their cultivation technology". Kartofel` i ovoshi, n.º 12() (4 de diciembre de 2020): 18–20. http://dx.doi.org/10.25630/pav.2020.65.67.004.
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В 2017–2019 годах изучены сортообразцы сладкого картофеля на староорошаемых лугово-сероземных почвах Зарафшанской долины. Цель исследований – комплексная оценка сортообразцов батата в условиях Зарафшанской долины по скороспелости, росту, развитию, интенсивному размножению, формированию урожая, компактности клубней в гнезде, продуктивности, урожайности и лежкости клубней и выделение из них перспективных, а также разработка приемов агротехнологии получения высоких урожаев для данных условий. Почвы опытного участка характеризуются благоприятными агрофизическими и водными свойствами и низким содержанием гумуса, нитратного азота, подвижного фосфора и содержанием обменного калия от низкого до среднего. Сравнивали 18 сортообразцов батата. Выделенные сортообразцы изучали при ширине междурядий 70 и 90 см со схемой 70×25 и 90×20 см по 1, 2 и 3 растения в гнезде. Для получения рассады сортообразцов батата брали по 40 клубней и высаживали 20–22 февраля в пленочной теплице при температуре 15–18 °C, заделывая их на глубину 3–5 см. Влажность почвы поддерживали на уровне 65–70%. Через 7–10 дней после высадки почки начинают прорастать, а через 43–48 дней формируется рассада высотой 12–15 см, готовая для высадки в поле. Высадка рассады, как и других рассадных культур (томата, перца, баклажана) – по схеме 70×20–25 см во второй-третьей декаде апреля. Уход включал в себя междурядную обработку (культивация), прополку, борьбу с сорняками, подкормку, поливы. Уборка урожая – в конце сентября-начале октября с помощью картофелекопателя. В результате исследований выделились сорта по скороспелости, дружности формирования ростков, ускоренному размножению, продуктивности, компактности клубней в гнезде и с высоким товарным урожаем – Сочакинур, Хар-Бей и Япон. Возделывание этих сортообразцов по схеме 70×25 и 90×20 см способствует получению товарного урожая высокого качества не менее 43–48 т/га. In 2017–2019, studies were conducted on the study of varieties of sweet potatoes on old-irrigated meadow-gray-earth soils of the Zarafshan valley. The purpose of the research is a comprehensive assessment of sweet potato varieties in the conditions of the Zarafshan valley in terms of early maturity, growth, development, intensive reproduction, yield formation, compactness of tubers in the nest, productivity, yield and keeping quality of tubers and the selection of promising ones, as well as the development of methods of agricultural technology for obtaining high yields for given conditions. The soil is characterized by favorable agrophysical and water properties and low content of humus, nitrate nitrogen, mobile phosphorus and a low-average content of exchange potassium. Eighteen sweet potato varieties were compared. The selected variety samples were studied with a row spacing of 70 and 90 cm with a scheme of 70×25 and 90×20 cm for 1, 2 and 3 seedlings in the nest. To obtain seedlings of sweet potato varieties, 40 tubers were taken and planted on February 20–22 in a film greenhouse at a temperature of 15–18 °C, seeding to a depth of 3–5 cm, the soil moisture was maintained at 65–70%. 7–10 days after planting, the buds began to germinate, and after 43–48 days, seedlings were formed with a height of 12–15 cm, which is ready for planting in the field. Planting seedlings in the field is carried out, as well as other seedlings (tomato, pepper, eggplant) according to the scheme 70x20–25 cm in the second or third decade of April. Growing includes inter-row processing (cultivation), weeding, weed control, top dressing, watering. Harvesting in late September, early October with a potato digger. As a result of the research, varieties were identified in terms of early maturity, sprout formation, accelerated reproduction, productivity, compactness of tubers in the nest and ensuring a high marketable yield – Sochakinur, Xar-Bey, and Japon. The cultivation of these varieties according to the scheme 70×25 and 90×20 cm contributes to the production of a commodity crop at 43–48 t/ha with good qualities.
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A., Zavhorodnii. "DEVELOPMENT OF THE AGRICULTURAL FOOD SPHERE OF THE SOUTHERN REGION". Scientific Bulletin of Kherson State University. Series Economic Sciences, n.º 40 (24 de diciembre de 2020): 46–50. http://dx.doi.org/10.32999/ksu2307-8030/2020-40-8.
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Global climate change factors and socio-economic consequences of the COVID-19 pandemic affect the current development of the agri-food sector of the Southern region of Ukraine. Agriculture is the main component of the agri-food sector. Economic development, food security of the region, living standards depend on agriculture. Crop and animal husbandry has a high level of development in the Southern region of Ukraine. The index of agricultural products has been fluctuating constantly in recent years. These oscillations have directions of decrease and directions of increase. However, the development of the agri-food sector has significantly decreased this year. The reason for the decrease is very negative climatic conditions, in particular, drought. Yields have fallen sharply, and companies are in a financial crisis. The state can help the affected enterprises and provide state support. Climatic and market conditions determine the need to adjust the development of the agri-food sector. New competitive varieties of grain are being introduced, which are able to ensure sustainable yields of high quality products in arid conditions of the steppe zone of southern Ukraine, work is being carried out on breeding highly productive breeds of sheep, sunflower hybrids are being created. It is important to introduce new cultures for the Southern region of Ukraine. Their cultivation should increase yields in arid climates. It is advisable to grow olives and make olive oil. The region has favorable conditions for growing peanuts, amaranth, saffron, sweet potatoes, chickpeas, asparagus, almonds. It is im-portant to improve the marketing component of traditional crops. The systematic implementation of the state policy of sustainable inno-vation and investment recovery and development with the involvement of public funds and resources of private business will contribute to ensuring the further development of the agri-food sector of the Southern region of Ukraine. The interaction between scientists, private enterprises, farmers, the state and other participants in ensuring the development of the agri-food sector on the basis of partnership is important. This interaction will help improve the implementation of the strategy for improving the agri-food sector. Similar trends will occur in the coming years. Comprehensive strategic reform of the agri-food sector of the southern region of Ukraine is necessary. This includes the improvement of traditional agricultural products. The introduction of innovations is crucial for further development. These measures will lead to the expansion of markets and economic growth.Keywords: agro-food sphere, agriculture, crop production, animal husbandry, viticulture, state support, innovations. Сучасний розвиток агропродовольчої сфери Південного регіону України обумовлений глобальними факторами зміни клімату та соціально-економічними наслідками пандемії COVID-19. Головною складовою агропродовольчої сфери є сільське господарство, яке має значний рівень розвитку в областях Південного регіону України. Протягом останніх років спостерігається щорічні коливання індексу сільськогосподарської продукції як у напрямках зменшення, так і збільшення показників. Однак, визначальні зміни у розвитку відбулись у поточному році, що обумовлене вкрай негативним впливом кліматичних умов на врожайність всіх основних сільськогосподарських культур та призвело до зменшення прибуткові кризового фінансового стану значної кількості господарств, які потребують державної підтримки для подальшого функціонування. Подібні тенденції будуть спостерігатись і в наступні роки, що вимагає комплексного стратегічного реформування агропродовольчої сфери Південного регіону України у напрямку удосконалення традиційної продукції, запровадження інновацій з метою розширення існуючих і формування нових ринків збуту. Ключові слова: агропродовольча сфера, сільське господарство, рослинництво, тваринництво, виноградарство, державна підтримка, інновації.
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Banda, Joseph, Patrick Chiza Chikoti y Langa Tembo. "Evaluation of Selected Zambian Popular Sweet Potato Genotypes for Response to Sweet Potato Virus Disease". International Journal of Plant & Soil Science, 31 de diciembre de 2020, 44–51. http://dx.doi.org/10.9734/ijpss/2020/v32i1730385.
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Aim: The objective of this study was to determine the effect of sweet potato virus disease (SPVD) on the beta carotene content, tuber weight and vine weight of selected popular sweet potato genotypes.
Study Design: The experiment was laid as a randomized complete block design (RCBD) with three replications.
Place and Duration of Study: The experiment was conducted for two cropping seasons (2015/16 and 2016/17) at the Zambia Agriculture Research Institute in Chilanga district of Zambia.
Methodology: The uninfected (control) genotypes of Kanga, Chiwoko and Chingovwa were evaluated alongside their SPVD infected genotypes. Genotypic infection was confirmed using molecular approaches, and data was collected at harvest on beta carotene content, tuber weight and vine weight.
Results: The results showed that SPVD affects the yield and beta carotene content of sweet potato. Significant differences (P< .001) for yield performance and beta carotene were observed. The yield reduction in percentage across seasons for all genotypes between the uninfected and infected genotypes ranged from 77% to 79% and 67% to 76% for tuber weight and vine weight respectively. Only Chiwoko exhibited higher levels of beta carotene among the genotypes. However, the SPVD infected Chiwoko genotype compared to the uninfected treatment produced mean beta carotene content of 39.1 µg/g and 91.5 µg/g respectively.
Conclusion: SPVD reduces the tuber weight, vine weight and beta carotene content in infected sweet potato genotypes.
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Akoetey, Winifred, Margaret Mead Britain y Ruben Omar Morawicki. "Potential use of byproducts from cultivation and processing of sweet potatoes". Ciência Rural 47, n.º 5 (2017). http://dx.doi.org/10.1590/0103-8478cr20160610.
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ABSTRACT: The cultivation and processing of sweet potatoes into a variety of products yields both solid and liquid organic waste. Solid waste includes peelings and trimmings from the sweet potato root and sweet potato leaves and vines. Liquid waste results from various processing methods and creates significant amounts of nutrient rich waste water. Sweet potato waste materials contain carbohydrates, proteins, phenolic compounds, macro and micro nutrients, and pigments that have the potential of being extracted or utilized for various downstream processes and products. This review examines many of the different ways that these waste products can be utilized.
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Daniel Mwangi, Ireri, Martin Miano y Lucas Macharia. "Optimization of Yields and Yield Components of Sweet Potatoes (Ipomea batatas (L.) Lam) Using Organic Manure and Phosphate Fertilizer". Asian Journal of Probability and Statistics, 1 de noviembre de 2019, 1–13. http://dx.doi.org/10.9734/ajpas/2019/v5i430142.
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Sweet potato production has been faced with various constraints including small land sizes and inappropriate agronomic practices, especially on management of soil fertility. Many studies that have been carried out on the effects of application of farmyard manure on sweet potatoes yields have just been used to get the best treatment within the range of treatments used. However, the designs used in data analysis are not appropriate for optimisation process. Therefore, there is need to use an appropriate design that will optimise the yields within the limited available resources for sustainable production of sweet potatoes. The objective of this study was to determine the optimum operating settings and to optimise the yields and the yield components in sweet potatoes. The study was conducted at Chuka University horticultural demonstration farm. The experiment was laid out in a Randomised Complete Block Design and replicated three times. The treatments included cattle manure and poultry manure (0, 5, 10, 15 and 20 tons per hectare) and inorganic phosphate fertilizer (0, 20, 40, 60 and 80 tons of P2O5 per hectare). Data was collected on number of tubers, tuber diameter, length and weight of tubers per plot. Central Composite Design (CCD) was applied in the optimization process. Data obtained was analysed using R statistical software and the second order mathematical model which described the response as a function of input variables, was generated. The study found that the optimal levels of inorganic phosphate, poultry manure and cattle manure that led to maximum yield were; 2.895 tons/ ha, 7.5 tons/ ha and 14.88 tons/ha, respectively. The study demonstrated that CCD can serve as an inexpensive tool in optimization of the sweet potato yield. The study was also useful to the farmers in the area of study since they can get information on the optimal levels of application organic manure and phosphate fertilizer that would lead to maximum yields.
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M.A Khayitov, M.I Mashrabov y N. Esirgapov. "The fertilizer norms to get higher effectiveness from vegetables". Proceedings of The ICECRS 3 (11 de diciembre de 2019). http://dx.doi.org/10.21070/icecrs.v3i0.256.
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The purpose of this article was to determine the effectiveness of phosphorus fertilizers in vegetable and potato crop rotation. Provides high and high yields with the use of 100 - 140 kg / ha of phosphorus fertilizers on the background of N200K90 in vegetable growing. The NKFU's reliably complementary crop, used as phosphorus fertilizer, is about 140 kg / ha in the onion crop, although it is consumed at the rate of R2O5 per hectare in white cabbage, potatoes and sweet peppers.
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Kiffo, Birhanu Lencha. "Participatory Varieties Selection and Evaluation of Improved Sweet Potato (Ipomoea batatas (L.) On-Farm at Different Agro-ecologies in Wolaita Zones Southern, Ethiopia". Journal of Experimental Agriculture International, 24 de agosto de 2019, 1–6. http://dx.doi.org/10.9734/jeai/2019/v40i230363.
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Aim: Ethiopia is considered to be one of the major producers of sweet potato and involves major lands for this purpose. Whereas, varieties of sweet potato that yields maximum are not yet known. So this particular study is aimed to identify the variety for high yield, quality sweet potato, as well as its quantitative evaluation to be done.
Materials and Methods: Area situated at Wolaita zone of SNNP regional state is considered as study venue; whereas the performance of fields is evaluated and specified the number of crop yield of that particular area.
Results and Discussion: Eleven sweet potato varieties and four local varieties were prepared for the preliminary evaluation. Observations came up with the following varieties namely OFSP1, Kulfo, Koka 6 and Hawassa 83 which were mostly preferred by farmers. Both sweet potatoes had high acceptability; with an average score of 10,11,12,16, (A) and 17, 18 19, (B) out of a maximum of 20, without any significant differences in preference. The varieties were divided into four sets, with each set having two test varieties and the check variety. This is to ensure that farmers will not have difficulty in evaluating and comparing too many varieties.
Conclusion: Variety of the potatoes that are preferred by the farmers is different from each other, which are come up with Participatory varietal selection (PVS) technique. So as differences in ranking are also preferred by them, which later ensure the genetically diverse factors and differentials in growing yield of the crops.