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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 178 for “"Crop yields"”.
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Predicting Crop Yields and Productivity Indices for Illinois Soils
Comparing established (Circular 1156) crop yields with predicted 1970s crop yields, generated from soil property models from base and benchmark soils, predicted high R2 values of 0.90 for corn, 0.90 for soybean, 0.81 for wheat, 0.81 for oat, and 0.88 for hay. These crop yield models were tested …
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Comparisons of crop yields using semi-organic and inorganic fertilizers
… are presented. Barley was used as the test crop in all experiments.Biomass production and nitrogen accumulation were studied in the field trials.In the field trials a greater stand density was produced using the semi-organic fertilizer as compared with an inorganic fertilizer and …
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Empirical statistical modelling for crop yields predictions: bayesian and uncertainty approaches
… uncertainty statistics to model agricultural crop yields, in a situation where there are neither sampling observations nor historical record. The Bayesian approach to a linear regression model is useful for predict ion of crop yield when there are quantity data issue s and the model structure …
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Crop Yields Response To Conservation Farming And Spatial-Temporal Effects In Zambia
We examined crop yields along a wide environmental gradient and spatial dynamics in soil organic matter in response to conservation farming (CF) in Zambia. Maize yields from farmer managed CF and traditional farming (TF) were not significantly different with over 280 on-farm trials with varying …
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Effects of different rates of liming on crop yields and soil reactions on different soil types
… profitable rates of applying lime for different crops on different soil types in the State, and to determine if possible the hydrogen ion concentration for the most economic yields of the different crops on different soil types. Plots will be laid out at Blacksburg, Staunton, Williamsburg, …
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Risk in agriculture : a study of crop yield distributions and crop insurance
Agriculture is a business fraught with risk. Crop production depends on climatic, geographical, biological, political, and economic factors, which introduce risks that are quantifiable given the appropriate mathematical and statistical methodologies. Accurate information about the nature of …
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A Problem on the Feasibility of Rural Digital Economy
… of queries in two years and growth of major crop yields for 2012 and 2018. The robustness checks have evaluated identification of the parameters and selection of the districts based on major crop yields for the selected years and average crop yields and compound annual growth rate (CAGR) of …
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Global Food Security Under Climate-Water-Energy Nexus
… the understanding of the associations between crops productivity and large scale and local scale climatic variables, climate change, technology enhancement and assessing food-water-energy nexus to enhance global food security in a sustainable manner considering current available resources. As …
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Tillage and cover cropping effects on soil properties and crop production
Cover crops (CCs) have been heralded for their potential to retain nutrients in the field and improve soil properties, but their adoption within the Midwestern Corn-Belt remains limited. We assessed the effects of integrating five sets of CCs into corn-soybean rotations under no-till and chisel …
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The Influence of Chilling and Heat Accumulation on Bloom Timing, Bloom Length and Crop Yield in Almonds (Prunus dulcis (Mill.))
… from 1996-2006, bloom length in days and final crop yields in pounds per tree for Nonpareil and Mission varieties. Data were collected from the University of California Cooperative Extension reports on the 1993-2006 Regional Almond Variety Trials in Butte, San Joaquin and Kern Counties. …
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Computational dissection of nitrate transport mechanism
… nutrient in plants and a major driving force for crop yields and food production. Annually, about 110 million tonnes of nitrogenous fertilizers are applied globally to enhance crop yields. However, over half of the nitrogen added to the soil is lost to the environment, with an average of only …
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An assessment of cropland application of alum sludge
Previous research has shown that crop land application of alum sludge can be a valuable method of residuals disposal and has been demonstrated to cause no adverse effects on soil properties and crop yields. Studies have shown that with good soil management practices essential plant macronutrient …
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Effects of certain fertilizer and lime treatments on some chemical properties of Cecil sandy loam
… of ground limestone which resulted in increased crop yields also tended to increasae organic matter and cation exchange capacity. 2. The lower soil reaction of the unlimed plots seemed to be more effective in retaining a larger percentage of the total dry matter produced as soil organic matter. …
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Pengaruh kombinasi limbah cair tahu dan kompos sampah organik rumah tangga pada pertumbuhan dan hasil panen kailan (Brassica oleracea Var. Acephala)
… kg of soil can increase plant height, leaf area, crop yields. Treatment of household organic waste compost of 675 gr / plant given best results on plant height, number of leaves, Leaf area and crop yields. The interaction between tofu liquid waste and household organic waste compost was no give …
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Assessing the variability of soil nitrogen mineralization
… N that will be mineralized and available to the crop during the growing season. During the 1994 and 1995 growing season, the spatial and temporal pattern of N mineralization was assessed on two central Kansas corn fields. Net N mineralization was measured in the field using a buried bag and a …
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Improving the thermal tolerance of photosynthesis in wheat
Wheat yields need to rise to meet growing demands due to population growth and changing diets. Additionally, the resilience of crop yields to climate change and rising temperatures needs to be improved. Inhibition of photosynthesis under sub-optimal environmental conditions decreases carbon …
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Moths & Legends The contribution of chitoumou, the edible caterpillar Cirina butyrospermi, to food security, agriculture and biodiversity in a low-intensity agroforestry system
… existing systems, in which they prey on plant crops. These insects often cause damage to crop yields, but also provide vital provisioning, regulating, maintaining and cultural ecosystem services. Yet, few data are available to enable farmers and policymakers to weigh up the costs and benefits …
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Food demand and supply under global change
… in turn impairs the agriculture sector, reducing crop yields namely due to soil degradation, water scarcity, and climate change. However, this is a more complex issue than it appears. Crop yields can be increased by use of agrochemicals and fertilizers which are mainly produced by fossil energy. …
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Finite Element Modeling and Experimental Validation for Off-Road Tire Performance
… is crucial for mission success and high crop yields. This project aims to gain a better understanding of the interaction between lugged tires and deformable soils to improve predictive models using finite element analysis (FEA). Through simulations and physical testing, this study …
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