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 38 for “"N Management"”.
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Toward circular and sustainable nitrogen (N) management in the US and globally
… efforts to improve farm-level nutrient management, persistent nutrient pollution indicates that N management challenges extend beyond individual farms and sectors. Therefore, a full life-cycle perspective, tracing N production, use, accumulation, and loss, is essential for identifying …
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Three essays on implications of on-farm precision experiments for N management
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Physiological and agronomic aspects of rice varietal responses to low and high nitrogen management
… for less than optimal environments at moderate N management levels. The objectives of this study were: 1) to examine the relationship between the uptake of N and different leaf characteristics, sink size, and grain yield of three morphologically distinct rice varieties; 2) to examine the CO2 …
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Using crop simulation to optimize variable rate experimentation
… trials and using that information for N-management advice was 9.8 $/ha. (2) The added value of gathering soil sampling data at the same time was 7.4 $/ha. (3) The optimal time to stop running trials and start using the information for N-management advice was one or two years, depending on …
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Nitrogen Management in No-till Winter Wheat Production Systems
… Plain. Little data are available evaluating N management strategies, optimum N rate prediction methods, or potential NO3 leaching under no-till wheat in soils and climate similar to the mid-Atlantic region. The objectives of our research were: (1) to determine economic optimum N fertilization …
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Crop Rotations for Sustainable Intensification
… how crop rotation design and nitrogen (N) management can contribute to achieving high and stable yields while improving nitrogen use efficiency (NUE) in arable cropping systems. The research is based on a long-term crop rotation experiment conducted at a high-yielding site in Northern …
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Soil testing and plant analysis to optimize nitrogen management in manured cornfields
… plant nutrients, but guidelines for manure management seldom employ these tools. The objective of this study was to develop guidelines for use of soil testing and plant analysis to optimize N management on manured cornfields. Data were collected in 205 on-farm trials where commercially …
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Dialing in the most corn-profitable and environmentally responsible nitrogen rate
Efficient nitrogen (N) management is essential for optimizing corn (Zea mays L.) productivity while minimizing environmental N losses in subsurface-drained continuous corn (CC) systems. This three-year study (2021 – 2023) at the Southwest Research and Outreach Center (SWROC) in Lamberton, Minnesota …
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Soil and tissue tests for determining nitrogen status of corn
… identified as a promising tool for improving N management in Iowa. These studies provided the first correlations for this soil test to depths of 60 cm, and they demonstrated the great stability of critical concentrations (NO[subscript]3[superscript]- or NO[subscript]3[superscript]- plus …
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Biochar and pH as Drivers of Greenhouse Gas Production in Denitrification Systems
… closes with a discussion of environmental N management strategies. The experimental portion of this work further explores these concepts by observing how biochar amendment and the modification of pH affect N2O production in the denitrification pathway in denitrifying bioreactors. Both pH and …
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Productivity and ecosystem services from purpose-grown energy crops
… Unmanned Aerial Vehicle (UAV)-based traits for N management of purpose-grown energy crops at field-scale, (iii) establish an economic criterion for identifying marginal land suitable for purpose-grown energy crops, and (iv) evaluate ecosystem services co-benefits associated with field-scale …
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Assessment of Spectral Reflectance as Part of a Variable-Rate Nitrogen Management Strategy for Corn
… develop a similar strategy for variable-rate N management in corn. Irrigated and non-irrigated studies were conducted during the 2002 and 2003 growing seasons in eastern Virginia. Plots were treated with various rates of preplant, starter, and sidedress N fertilizer to establish a wide range of …
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Study of nitrogen limitation and seed nitrogen sources for historical and modern genotypes in soybean
… are determined by the genotype, environment, and management practices (G × E × M) interaction. Closing yield gaps require a continuous improvement in the use of the available resources, which must be attained via implementation of better management decisions. Linear relationships between seed …
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Data-Driven and Process-Based Modeling Approaches for Advancing Irrigation Water and Nitrogen Management in Humid Cropping Systems
… both irrigation scheduling and nitrogen (N) management. In these settings, managers need accurate, field-specific soil water parameters and clear evidence on which irrigation–nitrogen strategies perform best under current and future weather. Chapter 2 addresses why accurate soil hydraulic …
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Cover Cropping: A Strategy to Healthy Soil and Nitrogen Management in Corn
… available N in soil in order to improve crop N management decisions. Cover crops have been recognized as an effective tool for protecting soil and enhancing soil function including N cycling. This recognition has increased the adoption of cover cropping in the United States. Despite this growing …
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Evaluation of Nitrogen Management Schemes upon Vine Performance in Cover Cropped Vineyards
… the two-year period of evaluation. None of the N management schemes negatively impacted canopy density, fruit zone light interception, or botrytis bunch rot incidence. The combination of both a soil-applied and foliar-applied N fertilizer may be the most effective means to increase both vine …
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Determination of Optimum Fall and Spring Nitrogen Fertilizer Rate for Maximizing Grain Yield of Soft Red Winter Wheat Sown at Variable Planting Dates
… date is important for winter wheat nitrogen (N) management as it dramatically changes the growing environment including temperature and moisture, ultimately affecting fertilizer efficiency and grain yield (GY). In Arkansas, high precipitation in the fall often forces farmers to delay planting and …
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Nitrogen recovery as influenced by soil type and moisture regime
… concerns has led to renewed interest in N management to maximize crop yield and minimize pollution potential. Experiments were conducted over a four year period at three locations in Illinois to evaluate the effects of soil type, N application rate, and soil moisture conditions on N loss …
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KGML-N: a knowledge guided machine learning modeling framework for efficient simulation of N-yield response
… interactions between crop characteristics, management, and the environment. Furthermore, its responses to climate and soil changes were consistent with decades of established agronomic knowledge. This work validates the KGML surrogate as a powerful, fast, and scientifically sound tool, …
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The role of cover crops in agroecosystem functioning
… role of cover crops in improving nitrogen (N) management and simultaneously providing multiple ecosystem services. Legume CC fertilized with poultry litter (PL) could replace 101 to 117 kg N ha-1 of fertilizer in corn (Zea mays L.) production. Rye (Secale cereale L.) CC fertilized with PL had a …
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