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 37 for “"corn yields"”.
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Simulating moisture stress and southwestern corn borer effects on corn yields
Typescript (photocopy).
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Modification and Evaluation of a Water Balance Model to Simulate Corn Yields in Drained Waterways
<p>A water balance model was successfully modified to determine yield response to tile drainage in waterways based on climate data. Modifications to the model were completed based on field measurements. Infiltration and tile drainage routines in the model were modified to improve the model …
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The Effect of Environmental Factors on High Corn Yields (Light, Planting Pattern, Row Width, Nutrients)
Corn production plays an integral part in the U.S. economy and is vital to the welfare of people worldwide. The effect of environmental factors on high corn yields was investigated with field studies using supplemental light, planting patterns, and plant competition.
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Soil-Specific, Late-Season Nitrogen and Potassium Applications to Increase Corn Yields in the Mid-Atlantic Coastal Plain
Corn grain yields can be limited by nitrogen (N) and potassium (K) availability on sandy coastal plain soils when soil moisture is adequate for high yields. This study evaluated irrigated corn grain yield response to late-season (just prior to tassel) N and K fertilizer applications, and enabled …
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What Stages In The Phenology Of Corn Are The Most Correlated With Rainfed Corn Yields In The Corn Belt Using Remote Sensing?
… Index (TCI), were assessed for state level corn yield correlation in the Corn Belt region of the United States for the years of 2007-2013. VCI and TCI were 16-km pixels which are derived from the Advanced Very High Resolution Radiometer (AVHRR). Corn pixels were identified by downloading …
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Field study with rock phosphate and superphosphate 1952 to 1990 and dissolution of rock phosphate in silage leachate
… (SP) on crops consisting of oats-alfalfa (hay)-corn-corn (rotation ""A"") and corn-soybean (rotation ""B""). Phosphorus applications ranged from 0 to 80 pounds P$\sb2$O$\sb5$/a. Agronomically, rotation ""B"" responded better than rotation ""A"". Eighty pounds of SP P$\sb2$O$\sb5$/a gave the …
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Soil Spatial Variability: Structures, Models, and Their Effects on Crop Yield Variability
… accounted for about 52%, and 39% of soybean and corn yields variability respectively. Particle size distribution and organic matter by influencing moisture and nutrient dynamics, were the most important factors determining yield variability in these soils.
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The potential of lime-stabilized and chemically-fixed municipal sewage sludges for land application as lime or nitrogen sources
… increasing sludge application rates on growth of corn. The CCE of the lime-stabilized and chemically-fixed sludges were 30. 9 and 58.1%, respectively. Application of sludges to soils resulted in rapid neutralization of soil acidity. Added organic-N was mineralized at an average rate of 32% in …
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Balancing water quality, nitrogen management, and corn production goals in Illinois
… (N) fertilizer inputs are required to maintain corn production in high-yielding cropping systems across much of the U.S. Midwest. However, applied N can also increase N losses through nitrate-nitrogen (NO3-N) leaching and nitrous oxide (N2O) emissions, negatively impacting water and air quality, …
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Long-term effects of land application of poultry manure on crop production, and soil and water quality under a corn-soybean rotation system in Iowa
… studied, its effects on water quality, under corn and soybean rotation, in Iowa have not been extensively studied. Therefore, a long-term study was initiated in 1998 to investigate the impacts of poultry manure on crop production and environmental quality (soil and water quality). This thesis …
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Farmers' expectations of yield differences between triple-stack and conventional corn hybrids
In 1996, genetically modified corn was commercially available for the first time. Since then, seed technology companies have introduced new genetically modified hybrids, including ―stacked trait hybrids‖ containing multiple traits. Adoption rates of the genetically modified seed increased for …
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Rye and vetch intercrops for reducing corn in fertilizer requirements and providing ground cover in the Mid-Atlantic region
… study conducted for two consecutive cover crop/corn sequences. I measured N yield of cover crops, their ground-covering ability, and their influence on soil structure and a subsequent corn crop. Nitrogen yields ranged from 53 to 187 kg/ha using either pure stands of hairy vetch or mixtures of …
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Cultivating Sustainability: Analyzing Soil Health Dynamics and Economics of Cover Crops in the Mid-Atlantic
… density, and enhanced soil moisture retention in corn production. Timing of CC termination played a crucial role in optimizing biomass production and nutrient accumulation. Overall accumulation rates were 44.4 kg dry biomass ha-1 d-1, 1.22 kg N ha-1 d-1, 0.16 kg P ha-1 d-1, 1.36 kg K ha-1 d-1, and …
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Corn responses to high levels of copper application as copper rich pig manure
… 32 kg Cu ha⁻¹ year⁻¹), had no adverse effects on corn yields. Copper levels in corn grain and leaf tissue were not increased by the nine annual applications of Cu rich manure or CuSO₄ , except for a slight increase in Cu concentration in corn grain from CuSO₄ application on only one soil. Copper …
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A Comparison of Corn Yield Forecasting Models
… yield forecasting methods. The study analyzes corn yields in Ohio and South Dakota for the years 1986 through 2012. A base model, with a trend and state dummy variable is developed. Two competing models, one with objective variables and one with subjective variables, are then developed as …
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A Comparison of Corn Yield Forecasting Models
… yield forecasting methods. The study analyzes corn yields in Ohio and South Dakota for the years 1986 through 2012. A base model, with a trend and state dummy variable is developed. Two competing models, one with objective variables and one with subjective variables, are then developed as …
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Relay- and double-crop production systems for wheat
… wheat row spacing on wheat and alternative crop yields, 3) evaluate the effects of intercropping and double-crop planting dates on alternative crops, and 4) evaluate double-crop planting dates of oil seed radishes on winter annual weed suppression and corn yields.
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Management and assessment of winter cover crop systems for supplying nitrogen to corn in the mid-Atlantic region of the United States
Research examining cover crop-corn systems focuses on corn planted into chemically desiccated cover crop residue using no-tillage practices. Two field studies including rye (Secale cereale L.), hairy vetch (Vicia villosa Roth), and rye+hairy vetch cover crops were established to determine the …
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Simulation of corn yield by a water management model for a Coastal Plain soil in Virginia
… YIELD version of DRAINMOD was used to predict corn yield for the subirrigation/controlled drainage site. Average corn yield predictions by the model agreed reasonably well with the observed average corn yield data with relative errors of 19.2, 4.4, and 8.1 percent for 1984, 1985, and 1986, …
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