Relevant bibliographies by topics / Improved varieties

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Improved varieties'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Improved varieties"

1

KEHINDE, Ayodeji Damilola. "DOES CREDIT ACCESS IMPROVE ADOPTION INTENSITY OF IMPROVED MAIZE SEED VARIETIES?" Cercetari Agronomice in Moldova 53, no. 4 (2021): 434–44. http://dx.doi.org/10.46909/cerce-2020-037.

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This study investigated the effect of credit access on the adoption intensity of improved maize varieties in Osun State. A number of 150 maize farmers were selected through a multistage sampling procedure from using a structured questionnaire. Descriptive statistics, adoption index, and Tobit regression model were used to analyse the data collected. The results showed that Majority of maize farmers were over 40 years (52.6%), male (87%), and married (87%). The result also showed that majority of the farmers did not adopt improved maize varieties (55%) in the state. Swan 1 improved variety was majorly adopted (87.1%), while DMR-ESR-W variety was less adopted (62.9%) in the State. Just a few of maize farmers had access to credit in the State (20%). The mean adoption intensity in the State was observed to 62%. Based on adoption intensity of improved maize varieties, adopters were classified as partial adopters (65%) and full adopters (35%). Tobit regression estimates showed that credit access, household size, secondary occupation, years of education and extension contact have significant effect on the adoption intensity of improved maize varieties. In accordance with the findings, we therefore recommend that microfinance institutions should look attentively at scaling up their credit services to enhancing adoption intensity of improved maize varieties.
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Soe, Ei Thazin, Yoshifumi Takahashi, and Mitsuyasu Yabe. "Adoption of Improved Soybean Varieties and Differences in Technical Efficiency Between Improved and Local Soybean Varieties in Southern Shan State, Myanmar." Journal of Agricultural Science 12, no. 8 (July 15, 2020): 55. http://dx.doi.org/10.5539/jas.v12n8p55.

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This study determined the factors influencing the adoption of improved soybean varieties and examined the technical efficiencies of improved and local soybean varieties production in Southern Shan State, Myanmar. For this study, data from a sample of 337 respondents were collected by employing a multi-stage random sampling method. Logit model was adopted to determine the factors influencing the adoption of improved soybean varieties. Additionally, a stochastic production frontier was used to examine technical efficiencies of improved and local soybean varieties. Results show that factors that positively and significantly influence the adoption of improved soybean varieties are education, market access, extension access and training access. Examination of technical efficiency reveals that labor, fertilizer, machinery, and use of pesticide and harvester are inputs that significantly contribute to improving production efficiency among the improved variety farmers while seeds, labor, and fertilizer are significant inputs of local soybean production. On average, the estimated yield of the improved soybean varieties is 1.51 t/ha, which is higher than the yield of local soybean varieties grown at 0.88 t/ha. It was also revealed that improved soybean varieties had a relatively higher level of mean technical efficiency (85.04%) than local varieties (70.13%) and significantly different at 1% level. The results show that improved soybean production is more efficient than local soybean production. Therefore, government and non-government organizations should improve and provide market access, efficient and effective extension services and training to encourage farmers to adopt improved soybean varieties.
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Gairhe, Samaya, Devendra Gauchan, and Krishna Timsina. "Adoption of Improved Potato Varieties in Nepal." Journal of Nepal Agricultural Research Council 3 (May 8, 2017): 38–44. http://dx.doi.org/10.3126/jnarc.v3i1.17274.

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Nepal is one of the top twenty countries where potato contributes substantially for the human diet. Enhancing adoption of improved potato varieties could impact on farmer’s income, household food and nutritional security. As such, using a multistage sampling procedure, a study was conducted to assess the determinants of improved potato varieties adoption in Nepal covering 180 samples in four districts, two in hills and two in Tarai region. The study revealed that; Kavre and Bardiya districts in the hills and Tarai, respectively, were dominated by improved potato varieties adoption. On the other hand, Dhankuta and Jhapa in the hills and Tarai, respectively, were dominated by local potato varieties adoption. The informal seed sources followed by agro-vet and market were the major sources for improved varietal adoption. Farmers’ accesses to training and formal seed sources were important factor determining improved potato varietal adoption. However, households with larger farm size were less likely to allocate more area for improved potato varieties as many of farmers were reluctant to take potato cultivation as agri-business and still follow subsistence farming. Potato R&D programs, therefore, need to strengthen formal seed system to enhance access to quality potato seeds and build producer’s capacity through regular training and exposer visits in order to improve adoption of improved potato varieties in Nepal.Journal of Nepal Agricultural Research Council Vol.3 2017: 38-44
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Ogeto, MA, JH Mohammed, and DG Bedada. "Adoption of improved potato varieties in jeldu district, oromia region, Ethiopia: a double-hurdle model." International Journal of Agricultural Research, Innovation and Technology 9, no. 2 (February 9, 2020): 15–22. http://dx.doi.org/10.3329/ijarit.v9i2.45405.

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Smallholder potato producers in Jeldu district produce potato for both home consumption and market. Adoption of improved varieties is suggested to improve and diversify farmers’ household income. This study intents to identify factors determining adoption and intensity of adoption of improved potato varieties in Jeldu district of West Shewa zone, Oromia region, Ethiopia. Both primary and secondary data were used. The primary data were collected from 140 sample households’ selected using two-stage random sampling techniques. Descriptive statics and double hurdle econometric model were used to analyze the data. Results indicate that sex of the household head, access to extension services, livestock ownership and farmers’ perception about the technology positively and significantly determined adoption of improved varieties in the district. In contrast, distance from the nearest market affected adoption of improved potato varieties negatively and significantly. Intensity of adoption is measured by the area of land allocated for improved potato varieties by farmers. The truncated result identified improved varieties yield perception, family size, livestock ownership and membership to agricultural cooperative influenced intensity of improved potato varieties adoption positively and significantly. Strengthening extension services to enhance farmers’ awareness about improved potato varieties infrastructure development, family planning, asset ownership and facilitating membership to cooperatives are recommended. Int. J. Agril. Res. Innov. Tech. 9(2): 15-22, December 2019
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Rizvi, S., R. Sharma, T. Srinivas, A. Manan, A. Osmanzai, S. Siddiqui, K. Wadan, N. Hakimi, and A. Rahmani. "Comparative evaluation of local and improved crop varieties through farmers’ participation on resource-poor farms in Afghanistan." Acta Agronomica Hungarica 60, no. 1 (March 1, 2012): 11–20. http://dx.doi.org/10.1556/aagr.60.2012.1.2.

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The introduction of new crop varieties is important to improve farm productivity and increase food security in developing countries. This study was conducted to determine the performance of improved varieties of wheat (Triticum aestivum L.), rice (Oryza sativa L.), mungbean [(Vigna radiata (L.) Wilczek] and potato (Solanum tuberosum L.) in comparison to local varieties through farmers’ participatory evaluation. The study was conducted during three years (2006 to 2008) with 948 farmers’ participatory field trials across 18 districts in three Eastern provinces (Nangarhar, Laghman and Kunar) of Afghanistan. One or more improved varieties of wheat, rice, mungbean and potato were compared to the most popular local variety. Data were recorded on the grain yield of wheat, rice and mungbean, and the tuber yield of potato. On average, the improved varieties outyielded local varieties by 69, 57, 70 and 65% for wheat, rice, mungbean, and potato, respectively. Economic analysis in terms of net benefit demonstrated that the adoption of improved varieties resulted in additional incomes of US$ 1840, 1299, 574 and 790 ha-1 for wheat, rice, mungbean and potato, respectively. These findings underline the importance of on-farm farmers’ participatory technology evaluation in developing countries to disseminate new crop varieties to improve farm productivity.
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Owusu, Victor, and Emmanuel Donkor. "Adoption of Improved Cassava Varieties in Ghana." Agricultural Journal 7, no. 2 (February 1, 2012): 146–51. http://dx.doi.org/10.3923/aj.2012.146.151.

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Amengor, Natson, Bright Owusu-Asante, Kwadwo Adofo, Patricia Acheampong, Benedicta Nsiah-Frimpong, Alex Nimo-Wiredu, Desmond Adogoba, et al. "Adoption of Improved Sweetpotato Varieties in Ghana." Asian Journal of Agricultural Extension, Economics & Sociology 23, no. 3 (March 23, 2018): 1–13. http://dx.doi.org/10.9734/ajaees/2018/39874.

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Sall, Samba, David Norman, and Allen M. Featherstone. "Adaptability of improved rice varieties in senegal." Agricultural Systems 57, no. 1 (May 1998): 101–14. http://dx.doi.org/10.1016/s0308-521x(97)00072-3.

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OMANYA, G. O., E. WELTZIEN-RATTUNDE, D. SOGODOGO, M. SANOGO, N. HANSSENS, Y. GUERO, and R. ZANGRE. "PARTICIPATORY VARIETAL SELECTION WITH IMPROVED PEARL MILLET IN WEST AFRICA." Experimental Agriculture 43, no. 1 (January 2007): 5–19. http://dx.doi.org/10.1017/s0014479706004248.

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A reconnaissance survey and participatory varietal selection trials (PVS) were conducted in four major pearl millet-growing countries of the Sahel between 2001 and 2003. The studies aimed to identify farmers' preferences in improved pearl millet varieties, increase awareness, test new varieties and enhance farmers' access to the improved varieties. Farmers selected five out of 10 tested varieties, with preferred characteristics, namely, maturity cycles of 80–90 d in the Sahel and 90–100 d in the Sudanian agro-ecozones, acceptable grain yield, compact and long (30–100 cm) panicles, a large number of tillers with panicles, adaptation and an acceptable taste. Farmers indicated that their local varieties were of superior adaptation and taste. They mentioned that hindrances to uptake and sustained use of improved varieties were due to lack of awareness, traditional values, seed unavailability, early maturity, bird damage and lack of fertilizer. The strong genotype × environment interactions in the Sahel suggests that breeding should be directed towards producing varieties adapted to specific zones rather than for wide adaptation. Notably, since farmers often cultivate pearl millet without any soil amendments, it may be advisable to disseminate varieties as a package (with fertilizer and agronomic instructions) rather than as varieties alone in a PVS programme, in order to achieve the full potential of improved varieties. The PVS trials are synergistic to plant breeding in identifying varieties suitable for harsh environments, which are difficult to duplicate in the research station. However, in the absence of formal distribution seed systems in the trial countries, village- or community-based seed production of varieties selected by farmers appears critical to the sustainable adoption of selected varieties.
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Tieman, Denise, Guangtao Zhu, Marcio F. R. Resende, Tao Lin, Cuong Nguyen, Dawn Bies, Jose Luis Rambla, et al. "A chemical genetic roadmap to improved tomato flavor." Science 355, no. 6323 (January 26, 2017): 391–94. http://dx.doi.org/10.1126/science.aal1556.

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Modern commercial tomato varieties are substantially less flavorful than heirloom varieties. To understand and ultimately correct this deficiency, we quantified flavor-associated chemicals in 398 modern, heirloom, and wild accessions. A subset of these accessions was evaluated in consumer panels, identifying the chemicals that made the most important contributions to flavor and consumer liking. We found that modern commercial varieties contain significantly lower amounts of many of these important flavor chemicals than older varieties. Whole-genome sequencing and a genome-wide association study permitted identification of genetic loci that affect most of the target flavor chemicals, including sugars, acids, and volatiles. Together, these results provide an understanding of the flavor deficiencies in modern commercial varieties and the information necessary for the recovery of good flavor through molecular breeding.
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Dissertations / Theses on the topic "Improved varieties"

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O'Donnell, Catherine Elizabeth. "Peruvian Food Insecurity in The Face of Recurrent Natural Disasters: A Two-Step Adoption Analysis for Improved Potato Varieties." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/81998.

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The International Potato Center (CIP) and Peruvian National Agricultural Research Institute (INIA) have invested a substantial amount of resources towards the development of improved potato varieties in Peru. These varieties are adaptable to the agro-ecologies of the Andes and have specific biotic and abiotic attributes. These efforts have led to the release of several prominent varieties including Canchan-INIA, Amarilis, Unica, Serranita and others. A 2013 household survey conducted by CIP was used to describe the diffusion of improved potato varieties in Peru. These data were also used to identify specific constraints to their adoption and dis-adoption. The assessment focused on a two-step adoption model, adoption and dis-adoption, by utilizing a Heckman Probit model to demonstrate two-steps of the adoption process. The Heckman Probit model was used to analyze variables affecting adoption and dis-adoption of improved varieties. Results suggest that adoption is region specific, time dependent, and in some cases relies on informal transmission methods. Risk to food insecurity and recurrent natural phenomena affect adoption and sometimes dis-adoption. Additionally, factors affecting a farmer's exposure to risk, such as information constraints and household head age, wealth, and social network were found to affect the adoption and dis-adoption of improved varieties.
Master of Science
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Zeng, Di. "Three essays on the adoption and impacts of improved maize varieties in Ethiopia." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64332.

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Public agricultural research has been conducted in Africa for decades and has generated numerous crop technologies, while little is understood on how agricultural research affects the poor and vulnerable groups such as children, and how farmers' perceptions affect their adoption decisions. This dissertation helps fill this gap with three essays on adoption and impacts of improved maize varieties in rural Ethiopia. The first essay estimates poverty impacts. Field-level treatment effects on yield and cost changes with adoption are estimated using instrumental variable techniques, with treatment effect heterogeneity fully accounted for in marginal treatment effect estimation. A backward derivation procedure is then developed within an economic surplus framework to identify the counterfactual income distribution without improved maize varieties. Poverty impacts are estimated by exploiting the differences between the observed and counterfactual income distributions. Improved maize varieties have led to 0.8-1.3 percentage drop in poverty headcount ratio and relative reductions in poverty depth and severity. However, poor producers benefit the least from adoption due to their small land holdings. The second paper assesses the impacts on child nutrition outcomes. The conceptual linkage between maize adoption and child nutrition is first established using an agricultural household model. Instrumental variable (IV) estimation suggests the overall impacts to be positive and significant. Quantile IV regressions further reveal that such impacts are largest among the most severely malnourished. By combining a decomposition procedure with estimates from a system of equations, it is found that the increase in own-produced maize consumption is the major channel such impacts occur. The third paper explores how farmers' perceptions of crop traits affects their willingness to adopt improved maize varieties. Under a random utility framework, a mixed logit procedure is implemented to model farmer's adoption intention, where perceptions of key varietal traits are first identified, and then instrumented using a control function approach to account for potential endogeneity. Perceived yield is found to be the most important trait affecting farmers' adoption intention. Further, yield perceptions among previous adopters appear to be affected by within-village peer effects rather than the real crop performance.
Ph. D.
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Miquitaio, Dizimalta. "Agronomic, Physiological, and Proteomic Characterization of Three Improved Varieties of Maize (Zea mays L.)." Doctoral thesis, Universidade Nova de Lisboa, Instituto de Tecnologia Química e Biológica António Xavier, 2020. http://hdl.handle.net/10362/101969.

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"Maize is the most important food crop in Mozambique. However, maize production is low and is cyclically impaired due to abiotic stresses such as recurrent droughts (particularly in the arid and semi-arid areas), soil infertility, floods, and cyclones events. Biotic stresses, such as pests and diseases, also affect food production. Altogether, these constraints lead to food insecurity and the need for humanitarian food aid from local and international communities. (...)"
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Marimo, Pricilla. "Gender Impacts of Molecular-Assisted Breeding: The Case of Insect and Disease Resistant Cassava in Nigeria." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33537.

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Cassava is the main staple crop in Nigeria. Using primary data from four south eastern states in Nigeria, the study assessed the gender impacts of improved cassava varieties. Comparative statistical analysis reveals that total female labor is higher than total male in cassava production, processing and marketing. Women spend more labor days than males for planting, weeding, harvesting, marketing and processing. The total female family labor is higher for adopters of new improved cassava varieties. There is however lower family labor input for both male and female adopters for clearing and plowing which are normally done by men. Significant determinants of female labor supply are number of children in the household, percent of females in the household providing labor on the farm, area under improved cassava varieties and total land area. There is a positive unexpected relationship between total female labor supply and number of children. For each of the decision making variables, there is a significant association between the gender of the spouse and the decision made except for the decision on family labor allocation. Probit results show a significant decrease in the probability that the wife makes the decision for family labor allocation, what inputs to buy and borrowing and traditional cassava income control with adoption. Results indicate that both men and women spend their income on services directly linked to the householdâ s welfare. More than half of the women ranked food as number one.
Master of Science
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Munthali, Grace Timanyechi. "Assessing farmers’ willingness-to-way for improved common bean seed varieties in Malawi : a case study of Kasungu and Dedza districts." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40344.

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Common beans are one of the most important food and cash crops for most Malawians. The insufficient production of the crop in the country coupled with low yields has made scientists give much interest to the crop so that they can address the constraints to the productivity problems. In this regard, breeders have been engaged in the development and release of improved varieties of common beans which in most cases are disease resistant, high yielding, drought resistant, and fast cooking. Therefore it is the interest of this study to find the reasons why productivity of the crop is still low despite the release of the improved varieties. The study adopted contingent valuation (CV), a method frequently used to assess willingnessto- pay of people for non-market goods or services and this was applied to assess farmer’s willingness-to-pay for the new improved bean seed varieties which are high yielding. Double bounded dichotomous choice with an open ended follow-up format was used to obtain the household’s willingness-to-pay. In addition; the study reviewed the existing dissemination channels of bean seed to make recommendations with regard to seed supply. Descriptive statistics from the 132 households interviewed shows that the structural constraints to seed acquisition are compounded by farmers’ poverty. Otherwise, most farmers are aware of the existence of improved varieties of common bean seed and perceive that with the use of this seed, productivity can improve hence willing to pay for the good. The study is 95% confident that mean price farmers are willing to pay for improved common bean seed is between MK 527.78 and MK 591.92. Three major existing informal dissemination channels of bean seed were discovered in the study areas. Therefore there is a need for government to work in collaboration with NGOs towards ensuring a formal supply system of bean seed characterised by vertically organised production and dissemination of tested and approved seed varieties, and using strict quality control rules, so that farmers can be assured of accessing improved seed varieties. This will increase the nation’s food security.
Dissertation (MSc Agric)--University of Pretoria, 2013.
gm2014
Agricultural Economics, Extension and Rural Development
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Dibba, Lamin [Verfasser], and Manfred [Akademischer Betreuer] Zeller. "Impact evaluation of improved rice varieties and farmer training on food security and technical efficiency in The Gambia / Lamin Dibba. Betreuer: Manfred Zeller." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2016. http://d-nb.info/1100055436/34.

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Myrick, Stephanie Nicole Bernice. "An Economic Impact Assessment of Cooperation-88 Potato Variety in China." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/74871.

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Cooperation-88 (C88) is a late blight resistant potato variety that was formally released in China in 2001 and has become popular in China's Yunnan Province. The International Potato Center (CIP) and Yunnan Normal University collaborated to produce the variety, which is one of CIP's most successful varieties. C88 is popular due to its high quality and taste, and it is used commonly in China's expanding potato chip processing market. The purpose of this study is to examine adoption of C88 in the Yunnan Province, its value chain, and economic impacts. The analysis indicates that C88 is still popular with 16.8% of the potato area in Yunnan devoted to this variety in late spring 2015. To examine factors affecting household decisions to adopt and the intensity of their adoption, village adoption, household adoption, and household intensity of adoption were assessed. A village's proximity to a metropolitan county was the most important factor explaining adoption and intensity of adoption. Households in villages closer to a metropolitan county disadopted at higher rates than those farther away. To quantify the economic benefits of C88 adoption, an economic surplus analysis was conducted. Total surplus changes ranged from $2 to 3 billion indicating significant economic benefits to consumers and producers in Yunnan.
Master of Science
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Serrat, Gurrera Xavier. "Applied biotechnology to improve Mediterranean rice varieties = Biotecnologia aplicada a la millora de varietats d’arròs mediterrànies." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/396188.

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The current world population is over 7.4 billion and expected to exceed 9 billion in 2040, causing a 70% increase in food demand. Global environmental degradation, in the form of salinization, pollution and global warming, has also reduced the availability of suitable arable land and water sources, contributing to promote crop improvement in order to increase the potential yields. Rice (Oryza sativa) is the most widely consumed staple food for a large proportion of the world population. Classical rice breeding programs use its natural variability to create new allelic combinations which are screened for selecting those presenting superior agronomic traits such as improved yield. Those improved lines are stabilized through inbreeding to maintain the phenotype in their progeny. Certified seed producers systematically select and propagate registered varieties year by year in order to maintain their uniformity and the original registered cultivar traits, since natural mutations, spontaneous breeding between varieties and alien grain contamination can introduce undesirable variability at this stage. Nowadays biotechnology is used to drive the improvement of rice traits such as increased yield and grain quality. Moreover it helps to rapidly bestow tolerance to biotic (diseases and insects) and abiotic (drought, salinity, cold temperatures, nutrients deficiency) factors. Some of the available biotechnological techniques applied for crop improvement are i) the genetic engineering, which allows the addition of foreign genes in the rice genome although being controversial due to the social and environmental concerns, ii) the anther culture, which fasten and improves the selection of new breeding lines, and iii) the Targeting Induced Local Lesions IN Genomes (TILLING) which combines the production of large mutant populations with the detection of mutants in genes of interest through molecular screening. The main aim of the thesis is to study different biotechnological tools and their applications to the improvement of Mediterranean rice varieties. To achieve this biotechnology is used to study the pollen dispersion of a genetically engineered rice line, to accelerate the stabilization process through anther culture technique and to introduce new variability using a mutagenesis protocol followed by molecular detection of mutants. In this thesis we first studied the pollen-mediated gene flow between wild rice, conventional rice and an herbicide resistant transgenic rice line in order to determine gene flow rates in relation to the distance and the prevailing wind speed and direction. Results showed that pollen dispersal is dramatically effected by the distances between rice plants and the speed and direction of the prevailing wind. Furthermore, the enhanced pollen dispersal capability of weedy rice can also play an important role in transgenic pollen dispersal, which unfortunately had been underestimated. Then, we adapted an anther culture protocol in order to efficiently obtain commercial dihaploid lines from a Mediterranean japonica variety. Furthermore, we described the greenhouse and field trials used to select the best lines for registration which are now being successfully commercialized. Finally, we developed a fast protocol for obtaining mutants with agronomic interest. This protocol is based on ethyl methanesulfonate mutagenesis of seed-derived calli. The in vitro regenerated mutant population plants were directly screened for senescence-related genes, allowing to shorten in more than eight months the common seed mutagenesis protocol. The molecular screening protocol was also optimized and several potential delayed senescence mutants were identified and tested.
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Rajan, Mala V. "Screening and Evolution of improved varieties of mulberry for irrigated conditions." Thesis, 1997. http://hdl.handle.net/2009/1474.

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Giridhar, K. "Studies on some improved varieties of mulberry and their influence on the silkworm, Bombyx mori L." Thesis, 1996. http://hdl.handle.net/2009/1335.

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Books on the topic "Improved varieties"

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Timothy, David H. Development and spread of improved maize varieties and hybrids in developing countries. Washington, D. C: Bureau for Science and Technology, Agency for International Development, 1988.

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Kunju, O. Abdul Rahiman. Transfer of agricultural technology; structural and functional linkages: A study of improved rice varieties. New Delhi: Concept Pub. House, 1992.

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Akpo, Essegbemon, Chris O. Ojiewo, Issoufou Kapran, Lucky O. Omoigui, Agathe Diama, and Rajeev K. Varshney, eds. Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7.

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Walker, T. S., and J. Alwang, eds. Crop improvement, adoption, and impact of improved varieties in food crops in sub-Saharan Africa. Wallingford: CABI, 2015. http://dx.doi.org/10.1079/9781780644011.0000.

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Mwabu, Germano M. Does adoption of improved maize varieties reduce poverty?: Evidence from Laikipia and Suba Districts in Kenya. Nairobi, Kenya: Kenya Institute for Public Policy Research and Analysis, 2008.

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Pandey, S. Patterns of adoption of improved rice varieties and farm-level impacts in stress-prone rainfed areas in South Asia. Metro Manila, Philippines: International Rice Research Institute, 2012.

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Johnson, I. G. Plan for developing and deploying genetically-improved varieties of blackbutt (Eucalyptus pilularis Smith) in New South Wales.: Part 1. Background information, overview of tree improvement concepts and methods and appropriate directions for the program. Part 2. Proposed tree improvement plan. Sydney: Forest Research and Development Division, State Forests of New South Wales, 1997.

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Tanzania. Wizara ya Kilimo na Chakula. Instructional Materials Development Unit/ASPS., ed. Attributes of improved crop varieties. Dar es Salaam, Tanzania: United Republic of Tanzania, Ministry of Agriculture and Food Security, Dept. of Training Institutes, Instructional Materials Development Unit/ASPS, 2002.

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S, Edison, and National Research Centre for Spices (India), eds. Spices varieties: A compendium of morphological and agronomic characters of improved varieties of spices in India. Calicut: National Research Centre for Spices, 1991.

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Watson, Dave, George Owuor, Xingming Fan, Jill Cairns, and Candice Gardner. Achieving Sustainable Cultivation of Maize: From Improved Varieties to Local Applications. Burleigh Dodds Science Publishing Limited, 2017.

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Book chapters on the topic "Improved varieties"

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Lightfoot, David A. "Developing Crop Varieties with Improved Nutrient-Use Efficiency." In Engineering Nitrogen Utilization in Crop Plants, 1–11. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92958-3_1.

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Puozaa, Doris K., Alhassan Nuhu Jinbaani, Desmond S. Adogoba, Douglas Busagri, Masawudu Abdul Rasheed, Abdul Rashid Issah, and Richard Oteng-Frimpong. "Enhancing Access to Quality Seed of Improved Groundnut Varieties Through Multi-Stakeholder Platforms in Northern Ghana." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 65–79. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_5.

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AbstractOne of the main constraints to groundnut production has been the use of low yielding varieties, susceptible to biotic and abiotic stresses. Multi-stakeholder platforms (MSPs) have been used by agricultural research organizations to help make their research more relevant and to facilitate the adaptation and dissemination of findings. In the implementation of TLIII project in Ghana, eight MSPs were set up with the objective to improve groundnut productivity among actors through improved access to varieties and related technologies. Through trainings, demonstrations and field days, the platform members totalling 347 (55% being female) were exposed to two existing improved groundnut varieties and several candidate varieties which were yet to be released. The actors have become important sources of high-quality groundnut seed in their communities and beyond with the production of 5 tons of seed of the new varieties. The seed farms where improved varieties were planted and managed using good agronomic practices (GAPS) yielded up to 1.6 tons/ha, 70% higher than the use of their old varieties and practices on their personal farms which gave less than 0.5 tons/ha. This form of experiential learning was observed to be very useful in the willingness of platform members to uptake technology. As unintended benefits, through the use of funds raised by the associations, the sanitation and health of some members and their households were improved, and many engaged in non-farm businesses. Going forward, good conflict resolution skills and access to funds for supporting platform activities and members’ individual interests would be very important in the sustainability of these platforms.
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Iorlamen, Teryima, Lucky O. Omoigui, Alpha Y. Kamara, Umar Garba, Nater Iyorkaa, Temitope Ademulegun, and Reuben Solomon. "Developing Sustainable Cowpea Seed Systems for Smallholder Farmers through Innovation Platforms in Nigeria: Experience of TL III Project." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 125–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_9.

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AbstractLimited access to and low use of quality seed of improved varieties rank among the topmost causes of persistently low cowpea yields in Nigeria. This paper presents experiences under the Tropical Legume III (TL III) project in facilitating the access of smallholder farmers to seeds of improved cowpea varieties through the establishment of innovation platforms (IPs) that were introduced in 2015 as part of the activities of the TL III project. There was rapid adoption and use of newly released varieties by farmers as a result of increased awareness of improved varieties through multi-media and user-friendly communication strategies and tools. During the four years of the project (2015–2018), a total of seven multi-stakeholder platforms (MSPs), which comprised six seed companies, 46 farmer groups, five public seed enterprises, two NGOs, and 718 individual seed entrepreneurs and other stakeholders, were established/strengthened to link actors in the cowpea value chain. Community-based seed producers were linked to seed companies while seed companies were linked to research institutions to access early generation seed (EGS). These activities led to the production of over 532 tons of basic seed and 8366 tons of certified/QDS seed of improved cowpea varieties that were entrenched in the seed system. Yield also increased almost twofold from 500 to 900 kg/ha on farmers’ field. Women and youth incomes increased as a result of seed entrepreneurship activities. The small packs approach was an efficient and cost-effective means of reaching more farmers with affordable quantities of seed and a wide range of preferred varieties.
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Lukurugu, Gerald Alex, Omari Kalanje Mponda, Essegbemon Akpo, Emmanuel S. Monyo, Joseph Nzunda, Happy Daudi, Athanas Joseph, Hamphfrey George Mlimbila, David Ndolelwa, and Charles Mkandawile. "Groundnut Seed Production and Distribution Through Multi-Stakeholder Platforms in Southern Region of Tanzania." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 9–30. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_2.

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AbstractSouthern Groundnut Platform (SGP) was established in 2016 to enhance seed access and adoption of improved groundnut varieties by farmers. The platform serves all districts in Lindi and Mtwara regions and Tunduru district in Ruvuma region. The platform has 53 members of which 22 are females and 31 are males. Since its establishment, there has been a marked increase in farm advisory services using government extension officers, community extension services and lead farmers. Groundnut seed production and distribution networks have increased to include more actors such as NGOs, seed companies, farmers groups and individual seed entrepreneurs. The increased seed access to farmers in the southern zone has contributed to 11% increase in area under cultivation resulting in 15% increase in groundnut production in Nanyumbu district between 2012 and 2018. New market linkages formed helped improve farm gate prices by 80% (from Tshs. 1000 to 1800). The platform also introduced 29 new labour saving technologies reducing women drudgery and increasing farmer improved varieties choice from 3 to 11 new varieties released between 2009 and 2018.
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Akpo, Essegbemon, Chris O. Ojiewo, Issoufou Kapran, Lucky O. Omoigui, Agathe Diama, and Rajeev K. Varshney. "General Context of Smallholder Farmers’ Access to Seed of Improved Legume Varieties and Innovation Platform Perspectives." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 1–7. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_1.

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AbstractThe high percentage of farmers (80–90%), including the pro-poor in remote areas, who have no access to recently released and high-yielding varieties proves the failure of various seed delivery models implemented so far. The ideal model to grow a crop commodity business to reach farmers in developing countries with seed of improved legume crop varieties has been a hard topic for development organizations. Past studies have shown that the full and balanced integration of multiple stakeholders’ knowledge and contexts into the process of agricultural technology development increases the uptake and ownership among end users.
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Sah, Uma, S. K. Chaturvedi, G. P. Dixit, N. P. Singh, and P. Gaur. "Organized Farmers Towards Chickpea Seed Self-Sufficiency in Bundelkhand Region of India." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 113–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_8.

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AbstractSmallholder partner farmers under TL-III project were organized into four registered Farmers’ Seed Societies for addressing the challenge of constrained availability of quality seed of improved chickpea varieties in Bundelkhand region of Uttar Pradesh state, India. These seed societies formed in Banda, Hamirpur and Chitrakoot districts contributed towards strengthening the formal seed system of chickpea by contributing 21.8 tons of chickpea seed (FS/TL) of recommended varieties (kabuli: Ujjawal, Shubhra; Desi: JG 14, JG 16 and JAKI 9218) and marketed it to institutionalized seed chains. More than 1500 partner farmers directly received the improved seed through farmers ‘seed societies while 1788 non-partner farmers received it indirectly through social networks. The interventions boosted chickpea productivity from 0.78 to 1.19 t/ha in the project villages. The efforts of the farmers’ societies to strengthen the informal seed system through farmer-to-farmer horizontal diffusion resulted in area enhancement under the introduced chickpea varieties up to 68% in the project villages while putting in place a system for supply of improved chickpea seed which can be replicated in other districts in India.
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Khanal, Narayan Prasad, and Keshav Lall Maharjan. "Adoption of Improved Rice Varieties in the Tarai Region of Nepal." In Communities and Livelihood Strategies in Developing Countries, 49–64. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54774-7_4.

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Sako, Dramane, Mamary Traoré, Folocoum Doumbia, Fodé Diallo, Moussa Fané, and Issoufou Kapran. "Kolokani Groundnut Innovation Platform Activities and Achievements Through TL III Project in Mali." In Enhancing Smallholder Farmers' Access to Seed of Improved Legume Varieties Through Multi-stakeholder Platforms, 51–64. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8014-7_4.

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AbstractGroundnut productions have been declining in Mali in spite of several new improved varieties being released, the key problem being inadequacy of the seed supply system. To solve this problem, Kolokani MSP was established in 2012 and reorganized with support from TL III in 2015 to include more stakeholders in the groundnut value chain—farmers particularly women, farmer associations, cooperative societies, seed producers, agro-dealers, grain traders, processors, research and extension. Four new varieties Fleur11, ICGV 86124, ICGV 86015, and ICGV 86024 were supplied to the platform for FPVS and among them two, Fleur 11 and ICGV 86124 were preferred for their high yields and large grain size under farmer conditions. Through training of trainers, the different members of the platform reached 1246 farmers among them 928 women with improved groundnut seed production, aflatoxin management, seed business plans, and small-scale mechanization. A total 47 FPVS, 50 Demonstrations, and three multi-locational variety trials were conducted annually from 2016 to 2018. Kolokani platform have played an important role in groundnut value chain by producing and marketing 85 tons groundnut certified seed of these varieties annually for farmers. This is expected to stop the national productivity decline while improving platform members’ livelihoods and nutrition status.
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Bahl, J. R., A. K. Singh, R. K. Lal, and A. K. Gupta. "High-Yielding Improved Varieties of Medicinal and Aromatic Crops for Enhanced Income." In New Age Herbals, 247–65. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8291-7_12.

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Gausset, Quentin, and Anna Folke Larsen. "Social constraints on the adoption of improved banana varieties in Arumeru District." In Farmers' Choice, 113–24. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 2012. http://dx.doi.org/10.3362/9781780447742.010.

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Conference papers on the topic "Improved varieties"

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Захарова, Мария, Maria Zakharova, Михаил Лукашевич, Mikhail Lukashevich, Татьяна Свириденко, and Tatyana Sviridenko. "DEVELOPMENT OF WHITE LUPIN VARIETIES WITH IMPROVED DROUGHT RESISTANCE." In Multifunctional adaptive feed production. ru: Federal Williams Research Center of Forage Production and Agroecology, 2019. http://dx.doi.org/10.33814/mak-2019-21-69-15-19.

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The article presents the estimation of white lupin breeding material for drought resistance at seed growing in the osmotic — sucrose solution. Promising drought resistant lines with a set of economic-and-biological characters have been selected. The varieties Mitchurinskiy and Piligrim have been developed on its base and are listed in the State List of Agricultural Achievements.
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Tillmann, Christoph, Saab Mansour, and Yaser Al-Onaizan. "Improved Sentence-Level Arabic Dialect Classification." In Proceedings of the First Workshop on Applying NLP Tools to Similar Languages, Varieties and Dialects. Stroudsburg, PA, USA: Association for Computational Linguistics and Dublin City University, 2014. http://dx.doi.org/10.3115/v1/w14-5313.

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Wang, Huaiyu, Sushil Pandey, and Orlee Velarde. "Pattern of adoption of improved rice varieties and its determinants in Cambodia." In Annual International Conference on Qualitative and Quantitative Economics Research. Global Science and Technology Forum (GSTF), 2012. http://dx.doi.org/10.5176/2251-2012_qqe40.

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Siddique, Zahed, and Rajeshwar Adupala. "Product Family Architecture Reasoning." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85340.

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Designing family of products, instead of single products, using a common platform approach has gained momentum in various industries. One of the main challenges faced by companies includes specifying a product family architecture to support the varieties. Designers need to consider different viewpoints related to product, assembly, manufacturing, etc. during the development of the product family architecture. The purpose of this paper is to present a configuration reasoning method to develop a product family architecture that not only satisfy, but also has improved characteristics for different viewpoints. This paper attempts to accomplish these objectives by developing representations for components, modules, product family architecture, and assembly process. The paper also presents mathematical formulations to generate feasible product family architectures, indices for architecture evaluation, rules to ensure feasibility and improve from multiple viewpoints. The application of this configuration reasoning framework is illustrated using identifying product family architecture for a set of coffeemakers.
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Liu, Zhengqi, and Yin-ping Chang. "The Virtual Cam – Hexagon Method Authentication on Locating Key Instant Centers of All Planar Single Degree of Freedom Kinematically Indeterminate Linkages up to Ten-Bar." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87802.

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At this moment all the methods which had been proposed have extremely limited application to only several specific constructions of kinematically indeterminate linkages, i.e. their complete sets of instant centers cannot be obtained simply from Kennedy Theorem due to lack of enough four-bar loop information in their constructions. Planar single degree of freedom linkages up to ten-bar include two different types of mechanisms, i.e. pure bar linkages, such as four-, six-, eight-, and ten-bar; and geared-bar linkages, i.e. geared-five, seven, and nine-bar. The huge varieties of different types and constructions can serve as great testbeds for these methods. This research systematically investigates and modifies the graphical approach, i.e. virtual cam method, whose employment will show it to be an almost-universal method which can be compliantly applied on very wide range of kinematically indeterminate linkages. The procedures and criteria of the methodology are proposed and examined thoroughly to help locate key instant centers of all planar single degree of freedom kinematically indeterminate linkages up to ten-bar so that their complete sets of instant centers can be located successfully. We call this modified and improved technique as Virtual Cam – Hexagon Method. The results are verified carefully against traditional Kennedy Theorem approach and CAD modeling.
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Fabbri, C., M. Napoli, M. Mancini, G. Brandani, R. Vivoli, and S. Orlandini. "Adopting precision agriculture to improve the cultivation of old wheat varieties in Tuscany (Italy)." In 12th European Conference on Precision Agriculture. The Netherlands: Wageningen Academic Publishers, 2019. http://dx.doi.org/10.3920/978-90-8686-888-9_57.

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Dewi, Candra, Wayan Firdaus Mahmudy, Rio Arifando, Yoke Kusuma Arbawa, and Beryl Labique Ahmadie. "Improve performance of extreme learning machine in classification of patchouli varieties with imbalanced class." In SIET '20: 5th International Conference on Sustainable Information Engineering and Technology. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3427423.3427424.

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Smirnova, L. G., I. I. Mikhailenko, M. I. Evdokimenkova, and A. A. Kuvshinova. "Ecological aspects of biological function of agroecosystems." In РАЦИОНАЛЬНОЕ ИСПОЛЬЗОВАНИЕ ПРИРОДНЫХ РЕСУРСОВ В АГРОЦЕНОЗАХ. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-15.05.2020.03.

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he main goal of the study is to optimize the ratio of high potential productivity of winter wheat, environmental sustainability and environmental improvement functions at the level of the variety, agrocenosis, agroecosystem and agrolandscape. Research has been conducted since 2017 in a field experiment organized on the basis of an adaptive landscape approach. It was deployed on the plakor and slope of the southern exposure in parts 1-3° and 3-5°. The object of the research – varieties ‘Veselka’, ‘Synthetics’, and ‘Ariadna’ created in the Laboratory of breeding and seed production of winter wheat of Belgorod Federal Agricultural Research Center of the Russian Academy of Sciences. The ‘Almera’ variety was taken as the standard. The soil cover is represented by typical Chernozem. To improve the productivity of agricultural crops in conditions of slope agrolandscapes, it is advisable to choose and place the variety according to the selected microzone. It is necessary to cultivate the varieties at the specific plots of arable land with the most optimal parameters for the complex orographic, climatic and edaphic conditions for this variety, and in which plants will be able to give the highest yield. Thus, in plakor, it is advisable to give preference to cultivating ‘Ariadna’ and ‘Veselka’ varieties (6.2-6.3 t/ha). For slope microzones, the ‘Synthetics’ variety (4.4-5.3 t/ha) is well suited. The presented set of varieties gave stable yield in difficult conditions of erosive agricultural landscapes, thus can be considered as an innovative development in crop production.
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Park, Hong Seok, and Prakash Dahal. "Development of Inner Rotating Core for a Molding Machine With Topology Optimization." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87576.

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Sulfur polymer concrete (SPC) is relatively new material used to replace Portland cement for making drain pipes currently being manufactured by horizontal spun technology which produces non-homogenous material distribution and low strength pipes. Due to drawbacks of existing machine, there is a necessity to design molding machine with improved technology for assuring homogenous compaction of material. In this research, a new machine is designed where inner rotating core is the main component for mixing, compressing and giving final shape of product. So, it is necessary to optimize this part in terms of topology to ensure robust functionality. First, the concept of a new molding machine was designed through problem exploration, idea generation, concept evaluation, and design improvement. The alternative was generated in consideration of customer requirements by applying TRIZ principles to overcome drawback of existing machine. One of the concepts was selected using scoring techniques where concepts are presented and compared with varieties of evaluating criteria. Topology optimization with density method has applied to design inner rotating core part for mass reduction and thereby optimum utilization of design space. Suitable engineering model was built based on loads, boundary condition and constraints. Loads are applied on inner core walls during mixing and compressing of sulfur concrete. Objective is focused to minimize the developed topology by maximizing stiffness. Repeated structural analysis is done to obtain the convergence data for optimal design. Optimized finite element topology is generated as CAD model for size optimization. The optimization study provided response charts of different design variables. Sensitivity analysis of the input variables helped in identifying the importance of each design variable and their respective effects on the output model. Different design points are rated on optimization study and best design points are chosen for the final dimension of structure. CATIA, OptiStruct and ANSYS are tools used for concept design, optimization of topology. To the end optimal topology is compared with the initial designed part in terms of weight and displacement. It is concluded that topology optimized model maximizes overall stiffness resulting in better and innovative product design with enhanced performance.
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Yılmaz, Emre, Mario Ganzeboom, Catia Cucchiarini, and Helmer Strik. "Combining Non-Pathological Data of Different Language Varieties to Improve DNN-HMM Performance on Pathological Speech." In Interspeech 2016. ISCA, 2016. http://dx.doi.org/10.21437/interspeech.2016-109.

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Reports on the topic "Improved varieties"

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Woldeyohanes, Tesfaye, Karl Hughes, Kai Mausch, and Judith Oduol. Adoption of improved grains legumes and dryland cereals crop varieties: A synthesis of evidence. World Agroforestry, 2021. http://dx.doi.org/10.5716/wp21022.pdf.

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Like other crop improvement programs, a key prerequisite for the CGIAR Research Program on Grain Legumes and Dryland Cereals (CRP GLDC) to generate large-scale impact is large-scale adoption. Hence, evidencing the breadth and depth of such adoption is both of intrinsic interest and important for estimating downstream impacts, such as improved food and nutritional security, income, resilience, and soil health. While various GLDC adoption studies have been undertaken, a recent effort to systematically review these studies and synthesize the results is lacking. We undertook such a review, identifying 69 studies and 35 independent country crop combinations (CCCs). To generate aggregated and updated estimates of GLDC improved varietal adoption, we devised and applied a procedure to estimate national cropping areas under such varieties and, in turn, the number of adopting households. Estimates derived from household surveys and expert opinion solicitation are treated with higher and lower levels of confidence, respectively. As of 2019, we estimate from higher confidence studies that improved GLDC crops were cultivated on 15.37 million hectares of land by 17.64 million households in CRP GLDC’s 13 priority countries. With the inclusion of lower confidence studies, these numbers increase to 32 and 44.64 million, respectively. We are further confident that the program exceeded its adoption target of 8.9 million newly adopting households from 2011, particularly when likely spillovers vis-à-vis non-surveyed areas, non-priority countries, and non-priority crops in priority countries are considered.
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Release and adoption of improved potato varieties in Southeast and South Asia. International Potato Center, 2018. http://dx.doi.org/10.4160/9789290605010.

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Release and adoption of improved sweetpotato varieties in Southeast and South Asia. International Potato Center, 2018. http://dx.doi.org/10.4160/9789290605034.

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