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Tesi sul tema "Alfalfa Seed"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Ottman, Michael. "Growing Alfalfa Seed in Arizona". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/146965.

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Abstract (sommario):

3 pp.
Due to worldwide shortages of non-dormant alfalfa seed, production opportunities and acreage have increased recently in Central Arizona. Seed production for profitability is challenging. Cultural practices differ from those commonly used in forage production. This article outlines management recommendations that may help to accomplish profitable seed alfalfa yields.

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Tickes, Barry R., e Michael Ottman. "Evaluation of Coated Alfalfa Seed". College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/201034.

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A test was conducted to evaluate the effect of two seed treatments on seven varieties of alfalfa. The treatments included Rhizocote, Rhizocote plus Apron plus Rovral and untreated seed. Significantly fewer seedlings emerged for the coated than the uncoated seed when planted on a pound for pound basis. First cutting alfalfa yields were neither increased nor decreased as a result of the seed treatments.

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Husman, Stephen H., e Michael J. Ottman. "Growing Alfalfa for Seed in Arizona". College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/552951.

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Abstract (sommario):

Originally Published: 1999; Revised
3 pp.
Seed production for profitability is challenging. Cultural practices differ from those commonly used in forage production. This article outlines management recommendations that may help to accomplish profitable seed alfalfa yields.

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Poteet, D. C., D. L. Robinson, A. K. Dobrenz e S. E. Smith. "The Effects of Alfalfa Seed Scarification in Saline Environments". College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/200811.

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The handling of alfalfa and other crop seed may result in seed scarification. Scarification may not affect germination of alfalfa seed in a non - saline environment, but may decrease germination where farmer's fields are severely salt-stressed.

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Dobrenz, A. K., D. C. Poteet, R. B. Miller e S. E. Smith. "Carbohydrates in Germination Salt Tolerant and Non-Salt Tolerant Alfalfa Seed". College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/201015.

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Alfalfa which is extremely salt tolerant during germination has been developed by researchers at the University of Arizona Carbohydrates were analyzed in the original parental gemiplasm 'Mesa- Sirsa' and Cycle₅Syn₂ and Cycle₈Syn₂ seed to determine why this seed could germinate in extremely saline conditions. Raffinose and sucrose were both significantly higher in the salt -tolerant germplasm compared to the parental germplasm; however, the magnitude increase of these free sugars was not sufficient to explain the increased ability of the seed to absorb water in a stress environment. The galactomannan content was not different among the alfalfa germplasms.

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Rethwisch, Michael D., e Steven McGuire. "Effects of Dry Seed+ Applied at Planting on Alfalfa Yield and Quality". College of Agriculture, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/202448.

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This experiment tested the effects of a cytokinin containing product (Dry Seed +) on CUF 101 alfalfa when applied with the seed at planting on October 24, 1996, at the rate of 1 /lb product to 100 lb of alfalfa seed. Data indicated a non - statistical yield response averaging 200 lbs an acrefrom treated fields the first cutting, valued at $11 /acre, but yields were identical the second harvest. Alfalfa quality means were very similar for both harvests. A positive net return of $9.76 /acre was noted by using Dry Seed +. More testing is suggested to confirm these findings.

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Stadler, H. Scott. "Response of alfalfa to foliar applications of long-chain fatty acids or seed treatments with Chevron XE-1019". Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04272010-020308/.

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Vinchesi, Amber Christine. "Assessing transportation impacts to alkali bees (hymenoptera| halictidae) and alfalfa seed production in the Walla Walla Valley". Thesis, Washington State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3628892.

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Alkali bees, Nomia melanderi, are native, solitary, soil–nesting bees commercially managed in southeastern Washington State. They nest in dense aggregations and are important pollinators of alfalfa produced for seed. The Washington State Department of Transportation (WSDOT) proposed safety improvements to US Highway 12 through the Touchet– Lowden–Gardena alfalfa seed growing district, an area critical to alfalfa seed production. This includes northern realignment to accommodate a wider roadway and avoid impacting any towns. Relocation of the highway will bisect several N. melanderi nesting aggregations and alfalfa fields. The study has three objectives: 1) survey the population abundance of N. melanderi across the region by comparing two sampling techniques; 2) determine bee flight heights across roads; and 3) determine N. melanderi foraging range using transgenic pollen.

Regression was significant between the two population sampling methods. Mean emergence hole counts, mean prepupal counts, and the surface area of the nesting aggregations, were used to estimate the abundance of N. melanderi in each bee bed. We constructed a “vehicular bee sweeper” designed to capture insects at specific heights over the roadway. The majority of N. melanderi flew below 2.1 m when no other factors were considered, but environmental conditions like temperature and wind speed affected number and flight height of N. melanderi. To determine N. melanderi foraging distance, adults were collected from their nest sites, and pollen on their hind tibia was tested for the presence or absence of Roundup–^®Ready alfalfa (RRA). The minimum foraging distance was 0.04 km and the maximum was 4.62 km. These distances suggest that N. melanderi will cross the highway for floral resources, increasing potential mortality.

Studying N. melanderi population abundance and flight characteristics allows us to understand the potential impacts of the proposed highway on bee populations and on alfalfa seed producers. The non–destructive quadrat method of sampling N. melanderi populations is robust compared to the destructive, labor-intensive, soil core method. Due to the low-flying nature and foraging distance of N. melanderi, vehicle strikes can be expected to cause mortality in bisected populations. Ultimately, recommendations will be made to highway designers to minimize and mitigate these effects.

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Robinson, David Lowell 1955. "RECURRENT SELECTION FOR GERMINATION SALT TOLERANCE IN ALFALFA (SALINITY, FORAGES, BREEDING)". Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/277015.

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Poteet, David Charles 1953. "Biochemical and physiological adaptations of alfalfa to germination stresses imposed by sodium-chloride". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277063.

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Nine cycles of recurrent selection for germination salt tolerance in alfalfa (Medicago sativa L.) were compared with their parental cultivar, 'Mesa-Sirsa'. Test seeds were produced in the same season and locale. Cycle 9 and Mesa-Sirsa showed 90% and 2.5% germination, respectively, in a -1.7 MPa NaCl medium. Cycle 8 germinated more vigorously compared to Mesa-Sirsa in stressed and non-stressed environments. Selection also enhanced germination speed and radicle length. Fresh seed and one year old seed showed similar percent germination. Scarification decreased germination in a saline solution. Mesa-Sirsa and Cycle 8 displayed the same pattern of water uptake in a salt solution. Salinity decreased water uptake in Cycle 8 and Mesa-Sirsa compared to the control. Cycle 8 and Mesa-Sirsa contained 7% galactomannan and 3.2% stachyose. Galactomannan was not an important factor in seed salt tolerance. Seed protein content was stable throughout the cycles of selection. Selection for germination salt tolerance in alfalfa significantly affected the percentage of seed amino acids.

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Gjuric, Radisa. "Genetic control of alfalfa seed quality characteristics". 1995. http://hdl.handle.net/1993/17620.

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Sora, Molu Dika. "Agronomic practices for alfalfa seed production and nitrogen fixation in the establishment year". 1995. http://hdl.handle.net/1993/19008.

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Coukell, Gary. "Alfalfa management effects under forage vs. seed production on cultivars of varying fall dormancy". 2001. http://hdl.handle.net/1993/12290.

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Yang, Lin-Lin, e 楊翎. "Effects of waterlogging on seed germination , plant Growth and root structure of alfalfa （Medicago sativa L.）". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/46sw24.

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碩士
國立嘉義大學
農學研究所
91
Alfalfa（Medicago sativa L.）is an important forage crop in Taiwan. The objective of this study was to determine the effect of waterlogging on germination, growth and histology of alfalfa seeds. In this study , the Hunter River of Taiwan alfalfa cultivar and Middle East were to be used for materials. The plants were waterlogging at 4th leaf , 8th leaf and booting stages for 10 days, respectively. The unwaterlogging treatment was to be control (CK). The results are showed the effects were not significant on the germination of alfalfa seeds in cultural dishes. Otherwise, the effects were significant on the germination percentage and mean germination day. Germination rates would be delayed. The electric conductivity of alfalfa seed leakage was significant increase after waterlogging 2 hours. The result of TTC (2,3,5-triphenyl tetrazolium chloride) test was showed that the activity of roots would decrease after waterlogging. The effect of water soluble carbonhydrate (WSC) significant on booting stages of Hunter River and Middle East alfalfa in spring and summer crop . The fresh forage yield was increased waterlogging at booting stage. Effect of waterlogging was less significant in Middle East than Hunter River. Chlorophyll content was significant decrease of waterlogging in spring crop. Waterlogging would be affected the absorbability of Mg, K and Ca. Observation the tissue of roots after waterlogging with upright Microscope and polarizing microscope by paraffin-cut section tech nigue. The results were showed the tissues of roots were damage able serious at 4th leaf, 8th leaf stages after waterlogging. However, the waterlogging toleration of Middle East is higher than Hunter River alfalfa. Waterlogging will significant affect the 4th leaf and 8th leaf stage of Hunter River and Middle East alfalfa in spring crop.

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Mostafa, Ayman Mahmoud. "Plant bugs (Hemiptera: Miridae) on buckwheat and seed alfalfa crops in Manitoba : dynamics, yield implications and management". 2007. http://hdl.handle.net/1993/8022.

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The assemblages of plant bugs in buckwheat and seed alfalfa in southern Manitoba mainly include the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), and the alfalfa plant bug Adelphocoris spp. While the most abundant species of mirid plant bugs in buckwheat is L. lineolaris, this species and Adelphocoris spp. are about equally common in both organic and conventional fields of seed alfalfa. Lygus lineolaris has two generations in both crops in all the study locations. Lygus bug adults can move from drying swaths of canola near buckwheat and seed alfalfa late in the growing season. However, it seems that canola is not the only source of migrated lygus bugs late in the growing season. Low temperature and precipitation are likely to reduce the ability of migrating insects to move into the crops in late summer. Caged buckwheat experiments showed that buckwheat yields were reduced mainly as a result of feeding of L. lineolaris nymphs at flowering stage. Insecticidal manipulation of insect populations confirmed this finding, and indicated that the nymphal population was synchronized with the flowering stage of the plant, mainly during August. In field insecticide trials, control that reduced nymphal populations at the flowering stage provided yields 12 - 78% greater than in unprotected controls. Beauveria bassiana applied against adults in September produced a significant fungal infection in bugs, although the number of bugs in treated and control plots did not differ. The gain in yield as a result of this application was inconsistent. Similarly, conventional insecticide application in early September did not consistently provide significant yield benefits. Over three years, controlling the plant bug population in seed alfalfa crops late in August and Spetember did not result in greater yield quantity or quality than in untreated controls. This lack of yield response occured despite the insecticide application effectively controlling the plant bug populations.

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Lu, Chih-ying. "Application of physical and chemical means to kill foodborne pathogens on alfalfa seeds". 2001. http://purl.galileo.usg.edu/uga%5Fetd/lu%5Fchih-ying%5F200112%5Fms.

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