Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Maize yield"”.
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Effect of winter cover cropping practices on maize yield and nutrient cycling
… lines, end of season soil fertility, and crop yields for each treatment. Best management practices consisted of a no-till cover crop scenario with side-dressed nitrogen application at vegetative growth stage 4 (V4). Soil fertility and crop nutrient uptake was measured prior to cover crop …
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Effect of dry wheat straw mulching and cowpea-maize intercropping on soil erosion and maize yield in Zambia
… effect of dry wheat straw mulching and cowpea-maize intercropping practices on soil erosion and maize yield. The field experiment was conducted at the University of Zambia, Great East Road Campus Field Station, in Lusaka, which is managed by the School of Agricultural Sciences. The study aimed …
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Predicting Maize Yield, Nutrient Concentration and Uptake in P and K Fertilized Soils: Pressurized Hot Water and Other Alternatives to Mehlich I Extraction in Guatemala Soils
… PHW-extracted nutrients could be used to predict maize yield, as nutrient content and uptake, soil, plant tissue and grain samples were obtained from a multiple-site field study and calibration studies were conducted using five rates of P and three rates of K on soils incubated without plants or …
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A generic protocol for an integrated land information system in humid subtropical highlands: a case study in Yunnan Province, China
… Soil fertility varied from poor to very fertile. Maize yield was significantly correlated with soil pH, total N, available N, P and K and thus the Soil Fertility Index. In 2002, maize yield was significantly correlated with manure and urea applications. There was considerable potential to increase …
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Agronomic and marker-assisted breeding strategies for improving nitrogen use efficiency in maize
… is an essential mineral nutrient required for maize (Zea mays L.) development. Increased maize yields will be necessary as the world demand for food increases. However, with the growing concern for food security, maize yield increases must be obtained using more sustainable agricultural …
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Minimizing the continuous maize penalty through intense management
As maize prices escalate with increasing demand for grain resulting from recent legislation mandating renewable fuel production, more Midwest farmers are interested in producing maize continuously. Increasing or maintaining maize yield levels becomes a challenge in continuous maize systems due to …
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Farmer Preferences for Attributes of Conservation Agriculture in Eastern Uganda
… farmers' willingness to pay for increases in maize yield, reductions in erosion, and reductions in land preparation labor requirements. It finds that farmers have a statistically significant willingness to pay for increases in yield and reductions in erosion, but not for reductions in planting …
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Competition For Above And Below Ground Resources Among Annual Species From The Plant To The Field: Quantification Analysis And Modeling
… and crop plants is a major determinant of crop yield losses. The objectives of this study are: i) to improve the understanding of the role of weeds in water use and crop water productivity, ii) to test, through field experiments and an individual based model, the effects of size inequality and …
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Exploring the potential of using remote sensing data to model agricultural systems in data-limited areas
… with a model calibrated with actual ground data (Maize_control). Ultimately leading to improved local cropping systems knowledge and the capacity to use CMs. As such, the study calibrated the DSSAT-CERES-Maize model using two generic soils (i.e. heavy clay soil and medium sandy soil) which were …
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Changes in soil properties and their effects on maize productivity following sesbania and pigeon pea improved fallow system in Eastern Zambia
… of 1-3 years have a potential to increase maize yield without additional inorganic nitrogen fertilizers. The mechanisms responsible for improved maize yield are partially understood. therefore the objective of the study were (1) to quantify some changes in soil properties that may be …
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Essays on Malawian agriculture: Micro-level welfare impacts of agricultural productivity; profitability of fertilizer use; and targeting of fertilizer subsidy programs
… and agricultural productivity is measured by maize yield and value of crop output per hectare. Depending on the measure of welfare, the impact of agricultural productivity was estimated with a household fixed effects estimator, a two-part estimator or a correlated-random effects ordered probit …
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A tripartite study on Bayesian estimation of photosynthetically active radiation, impacts of future climate, and adaptation strategies on crop production: a spatial model framework for the Eastern Kansas River Basin
… adaptation strategies for rainfed and irrigated maize production in EKSRB using a combination of county-level and fine-scale spatial protocols. We quantified location-specific impacts under heterogeneous responses to environmental variability and different water management techniques using …
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Evaluation of Soil Fertility and Performance of Maize(Zea Mays L.)in Small Holders Maize Farms in Namtumbo District, Ruvuma Region.
Maize yield in Namtumbo district is low and ranges from 1-2 t/ha in most small holders farms as compared to 7-10 t/ha reported in other parts of Tanzania. The yield is below the crop potential productivity due to low use or not using fertilizers completely. The objectives of the study were to …
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The use of maize streak virus (MSV) replication-associated protein mutants in the development of MSV-resistant plants
Maize streak virus (MSV) is the type member of the Mastrevirus genus of the Geminiviridae. As the causal agent of maize streak disease (MSD), MSV is the most significant pathogen of maize in Africa, resulting in crop yield losses of up to 100%. Transmitted by leafhoppers (Cicadulina spp.), MSV is …
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The use of maize streak virus (MSV) replication-associated protein mutants in the development of MSV-resistant plants
Maize streak virus (MSV) is the type member of the Mastrevirus genus of the Geminiviridae. As the causal agent of maize streak disease (MSD), MSV is the most significant pathogen of maize in Africa, resulting in crop yield losses of up to 100%. Transmitted by leafhoppers (Cicadulina spp.), MSV is …
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An investigation of the impacts of intra-seasonal rainfall variability on the maize growing season in Limpopo Province, South Africa from 1990-2014
Rain fed maize is an important staple food crop for rural communities in Southern Africa as it plays a major role in ensuring food security and improving livelihoods. Rainfall consistency and intensity is an essential requirement for successful maize growing seasons. The variability of …
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Characterizing phosphate desorption kinetics from soil : an approach to predicting plant available phosphorus
… were observed between the rate coefficients and maize grain yield for both soil types. The correlation between the cumulative P extracted and maize yield (r = 0.997**) however was highly significant for Ermelo soils. This method was also used to determine the changes in the different P pools and …
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Time And Rate Of Nitrogen Fertilization Influence Maize Nitrogen Use Efficiency And Soil Enzyme Activity
… applications of differing nitrogen (N) rates for maize (Zea mays L.) on an irrigated Hubbard-Mosford loamy sand complex at Becker, a non-irrigated Normania loam soil at Lamberton, and a non-irrigated Nicollet clay loam soil at Waseca, MN. Fall and spring treatments were applied at recommended and …
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Quantifying the effect of fall armyworms on maize yields in a resource constrained economy: A case study in Zambia
… (FAW) is a voracious pest, which has ravaged maize yields in Sub-Saharan Africa since they were first reported in 2016. Their exact impact on maize yields is unclear, with a wide discrepancy in the existing estimates which suffer from potential endogeneity in self-reporting,measurement error …
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Climate change and global crop yield: impacts, uncertainties and adaptation
… of climate change impacts on global crop yield, and of farmers’ adaptive capacity, remains incomplete as previous global assessments: (1) inadequately evaluated the role of extreme weather events; (2) focused on a small subset of the full range of climate change predictions; (3) overlooked …
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