Resultados de búsqueda - "A"

Genetic dissection of triple rust resistance (leaf, yellow, and stem rust) in Kenyan wheat cultivar, “Kasuku” por Qureshi, Naeela, Singh, Ravi Prakash, Bhavani, Sridhar

“…This study aimed to identify quantitative trait loci (QTL) associated with rust resistance in the CIMMYT wheat line Kasuku, released in Kenya in 2018. A recombinant inbred line (RIL) population (181 lines) derived from Kasuku (triple rust-resistant) and Apav#1 (triple rust-susceptible) was evaluated under artificial LR and YR epidemics in Mexico and YR and SR in Kenya. …”
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Stripe rust resistance in historical wheat cultivars at seedling and adult plant stages and tagging effective resistance genes using molecular markers por Majeed, Khawar, Sufyan, Muhammad, Abbasi, Kainat, Ahsan, Rafia, Bux, Hadi, Zakria, Muhammad, Fayyaz, Muhammad, Mirza, Javed Iqbal, Ali, Mohsin, Rasheed, Awais, Zhonghu, He

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Regenerating mahogany (Swietenia macrophylla King) on clearing in Mexico's Maya forest: the effects of clearing method and cleaning on seedling survival and growth por Snook, Laura K., Negreros-Castillo, P.

“…This approach to regeneration could be expected to yield densities of 100 commercial sized mahogany trees/ha among a matric of 400 naturally regenerated trees/ha of other species. …”
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The association between the use of antibiotics and distribution of antimicrobial resistance in Escherichia coli from pigs in Japan por Goto, M., Makita, K., Ozawa, M., Asai, T., Tamura, Y.

“…As explanatory variables, the use of antibiotics, husbandry factors and interaction terms between them with a p-value less than 0.2 in univariate analysis were selected. …”
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The brokerage institutions and smallholder market linkages in marketing of horticultural crops in Fogera woreda, south Gondar, Amhara National Regional State por Tamir, S.E.

“…Primary data were collected from a very wide number of respondents at all stages of the market channel where brokers are expected to play role. …”
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The association between the use of antibiotics and distribution of antimicrobial resistance in Escherichia coli from pigs in Japan por Goto, M., Makita, K., Ozawa, M., Asai, T., Tamura, Y.

“…As explanatory variables, the use of antibiotics, husbandry factors and interaction terms between them with a p-value less than 0.2 in univariate analysis were selected. …”
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Modeling lactation curve and comparison of models fitness to different lactation data of indigenous and crossbred cows por Gebreyohannes, G., Tegegne, Azage, Diedhiou, M.L., Hegde, B.P.

“…Cows that calved during Arfasa (83.4%) had a higher fit than those in other calving seasons. …”
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Strategic supplementation of crossbred steers fed forages from cereal-legume cropping systems with cowpea hay por Umunna, N.N., Osuji, P.O., Nsahlai, I.V.

“…Forty-four crossbred steers were used in a 252-day trial to assess the feeding value of forages from two cereal-legume cropping systems Cropping system 1 comprised oat-vetch (Avena sativa-Vicia dasycarpa), wheat-trifolium (Triticum aestivum-Trifolium steudneri), teff (Eragrostis tef) and cowpea )Vigna unguiculata). …”
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Collective management on communal grazing lands: Its impact on vegetation attributes and soil erosion in the upper Blue Nile basin, northwestern Ethiopia por Alemayehu, M., Amede, Tilahun, Bohme, M., Peters, Kurt J.

“…This study was undertaken in Maynet village in the upper Blue Nile basin, northwestern Ethiopia, to assess the impacts of three different types of grazing land management (GLM) and two slope gradients (<10%; 15–25%) on aboveground herbaceous biomass yield, ground cover, species richness, runoff, soil loss and soil bulk density of grazing lands. The GLMs include (a) freely open communal GLM, (b) restricted communal GLM – collective management of communal grazing land locally named as ‘yebere sar’ and (c) private holding GLM. …”
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Managing soil fertility to adapt to rainfall variability in smallholder cropping systems in Zimbabwe por Rurinda, J.P., Mapfumo, Paul, Wijk, Mark T. van, Mtambanengwe, F., Rufino, Mariana C., Chikowo, Regis, Giller, Kenneth E.

“…Maize grain yields for the early and normal planted cultivars were similar for each fertilization rate, suggesting there is a wide planting window for successful establishment of crops in response to increased rainfall variability. …”
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Changing wildlife populations in Nairobi national park and adjoining Athi-Kaputiei plains: Collapse of the migratory Wildebeest por Ogutu, Joseph O., Owen-Smith, N., Piepho, Hans-Peter, Said, Mohammed Yahya, Kifugo, S.C., Reid, Robin S., Gichohi, H., Kahumbu, P., Andanje, S.

“…Deterioration in grassland conditions in the park following high rainfall plus lack of burning may have discouraged these animals from using the park as a dry season refuge. Our findings emphasise the interdependency between the park and the plains for seasonal wildlife movements, especially in exceptionally dry or wet years. …”
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Shifting towards market-oriented irrigated crops development as an approach to improve the income of farmers: Evidence from northern Ethiopia por Woldewahid, G., Gebremedhin, Berhanu, Berhe, Kahsay, Hoekstra, Dirk

“…The transformation processes are based on market-oriented diversification into high value irrigated crops, based on a value chain approach, and demand driven, participatory and knowledge based extension. …”
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Assessment of the performance of selected irrigation schemes in Ethiopia por Ayana, M., Awulachew, Seleshi Bekele

“…Pricing of irrigation water and the cost incurred in water conveyance were found to have a positive effect on the land and water resources of the irrigation schemes. …”
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Water-use accounts in CPWF basins: Simple water-use accounting of the Nile Basin por Kirby, M., Eastham, Judy, Mainuddin, M.

“…Rainfed agriculture is the most important water use by volume in only four catchments, Kessie, Paraa, Panyango, and the Sennar Dam where it comprises 24%, 27%, 30%, and 38% of the available water. Nevertheless, it is a relatively important use of water in many of the catchments, using 10% or more of the available water in 14 catchments of the Basin. …”
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Water-use accounts in CPWF basins: Models and Concepts por Kirby, M., Mainuddin, M., Eastham, Judy

“…Rainfed agriculture is the most important water use by volume in only four catchments, Kessie, Paraa, Panyango, and the Sennar Dam where it comprises 24%, 27%, 30%, and 38% of the available water. Nevertheless, it is a relatively important use of water in many of the catchments, using 10% or more of the available water in 14 catchments of the Basin. …”
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Agronomic use efficiency of N fertilizer in maize-based systems in sub-Saharan Africa within the context of integrated soil fertility management por Vanlauwe, Bernard, Kihara, Job Maguta, Chivenge, Pauline P., Pypers, Pieter, Coe, R., Six, Johan

“…High quality organic inputs (Class I) and those with a high C-to-N ratio (Class III) or high lignin content (Class IV) did not affect N-AE values in comparison with the sole fertilizer treatment. …”
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Comparative description of land use and characteristics of belowground biodiversity benchmark sites in Kenya = Descripción comparativa de usos del suelo y características de la div... por Muya, EA, Karanja, N, Okoth, Peter F., Roimen, H, Mung'atu, Joseph K., Mutsotso, B, Thuranira, EG

“…The productivity index (PI) followed a similar trend, being highest in the natural forest and grassland (40-50%) and lowest in horticultural and maize-based systems (15-20%) It was concluded that the decline in soil quality and productivity was linked to increased land use intensification and lack of knowledge of the appropriate management practices for sustainable ecosystem functions and services.…”
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Cultivation potential of different mango varieties in Kenya, considering likely impacts of climate change por Ngulu, James, Kindt, Roeland, Luedeling, Eike, Kehlenbeck, Katja

“…This study sought to establish the spatial distribution and performance of mango varieties along an elevation gradient across a broad spectrum of agro-ecological zones. Farmers’ opinions about the future prospects of mango cultivation were documented. …”
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Nitrous oxide emissions in Midwest US maize production vary widely with band-injected N fertilizer rates, timing and nitrapyrin presence por Burzaco JP, Smith, D.R., Vyn TJ

“…Nitrification inhibitors have the potential to reduce N2O emissions from maize fields, but optimal results may depend on deployment of integrated N fertilizer management systems that increase yields achieved per unit of N2O lost. A new micro-encapsulated formulation of nitrapyrin for liquid N fertilizers became available to US farmers in 2010. …”
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Herbivore dynamics and range contraction in Kajiado County Kenya: Climate and land use changes, population pressures, governance, policy and human-wildlife conflicts por Ogutu, Joseph O., Piepho, Hans-Peter, Said, Mohammed Yahya, Kifugo, S.C.

“…Here we analyze the population dynamics of 15 wildlife and four livestock species monitored using aerial surveys from 1977 to 2011 within Kajiado County of Kenya, with a rapidly expanding human population, settlements, cultivation and other developments. …”
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