The Experts below are selected from a list of 68202 Experts worldwide ranked by ideXlab platform
Noel D. Uri - One of the best experts on this subject based on the ideXlab platform.
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A note on Nitrogen Fertilizer application timing
Applied Mathematical Modelling, 1995Co-Authors: Huang Wen-yuan, Noel D. UriAbstract:Abstract This paper is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. An analytical model is developed to determine the necessary conditions for the optimal timing of the application of Nitrogen Fertilizer. The empirical results explain various observed application timings of Nitrogen Fertilizer being used in cotton production in Mississippi and provide an estimate of the cost to a farmer when he or she must comply with a restriction on the timing of the application of Nitrogen Fertilizer.
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The effect of farming practices on reducing excess Nitrogen Fertilizer use
Water Air and Soil Pollution, 1994Co-Authors: Wen Yuan Huang, Noel D. UriAbstract:A Nitrogen balance model is used to investigate the adoption of a crop rotation and the limitation on the application of Nitrogen Fertilizer to reduce excess Nitrogen. For a farmer initially planting corn continuously, the adoption of a soybeans-corn rotation will have a smaller compliance cost but it will not eliminate the excess application of Nitrogen Fertilizer under a relatively low Nitrogen Fertilizer to corn price ratio. An explicit limitation on Nitrogen Fertilizer use would be needed to achieve this objective. Limiting Nitrogen Fertilizer use on cropland susceptible to a high potential for leaching will have a smaller compliance cost than on cropland with a moderate potential for leaching.
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The application timing of Nitrogen Fertilizer
Water Air & Soil Pollution, 1994Co-Authors: Wen Yuan Huang, Leroy T. Hansen, Noel D. UriAbstract:This paper is concerned with factors affecting a farmer's decision concerning the timing of Nitrogen ferilizer application. These factors include the expected Nitrogen loss associated with different application times, the expected seasonal fluctuations in Nitrogen Fertilizer prices and operating costs, and the perceived risk of not being able to apply Nitrogen Fertilizer during the growing season. This paper shows that a split application of Nitrogen Fertilizer is an optimal strategy for both risk-neutral and risk-averse cotton farmers in the United States if there is a possibility that they may be unable to apply Nitrogen Fertilizer after planting. Furthermore, a risk-averse cotton farmer relative to a risk neutral farmer will apply more Nitrogen Fertilizer prior to planting.
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Timing Nitrogen Fertilizer Applications To Improve Water Quality
Staff Reports, 1994Co-Authors: Wen Yuan Huang, Noel D. Uri, Leroy T. HansenAbstract:roper timing of the application of Nitrogen Fertilizer can be an effective tool to reduce Nitrogen losses. This report is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. Analytical models are developed to determine the necessary conditions for the optimal timing of the application of Nitrogen Fertilizer. The models, coupled with an estimated cotton yield function, are used to assess a farmer's decision on the optimal application timing of Nitrogen Fertilizer in cotton production. The empirical results explain various observed application timings of Nitrogen Fertilizer being used in cotton production in Mississippi, and provide an estimate of the cost to a farmer complying with a restriction on the timing of Nitrogen Fertilizer application.
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Assessing a farmer's decision concerning the application timing of Nitrogen Fertilizer
Environmental Geology, 1994Co-Authors: Wen Yuan Huang, Noel D. Uri, L. HansenAbstract:This paper is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. Analytical models are developed to determine the necessary conditions for the optimal timing of the application of Nitrogen Fertilizer. The models, coupled with an estimated cotton yield function, are used to assess a farmer's decision on the optimal application timing of Nitrogen Fertilizer in cotton production. The empirical results explain various observed application timings of Nitrogen Fertilizer being used in cotton production in Mississippi, USA, and provide an estimate of the cost to a farmer when he or she must comply with a restriction on the timing of the application of Nitrogen Fertilizer.
Wen Yuan Huang - One of the best experts on this subject based on the ideXlab platform.
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The effect of farming practices on reducing excess Nitrogen Fertilizer use
Water Air and Soil Pollution, 1994Co-Authors: Wen Yuan Huang, Noel D. UriAbstract:A Nitrogen balance model is used to investigate the adoption of a crop rotation and the limitation on the application of Nitrogen Fertilizer to reduce excess Nitrogen. For a farmer initially planting corn continuously, the adoption of a soybeans-corn rotation will have a smaller compliance cost but it will not eliminate the excess application of Nitrogen Fertilizer under a relatively low Nitrogen Fertilizer to corn price ratio. An explicit limitation on Nitrogen Fertilizer use would be needed to achieve this objective. Limiting Nitrogen Fertilizer use on cropland susceptible to a high potential for leaching will have a smaller compliance cost than on cropland with a moderate potential for leaching.
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The application timing of Nitrogen Fertilizer
Water Air & Soil Pollution, 1994Co-Authors: Wen Yuan Huang, Leroy T. Hansen, Noel D. UriAbstract:This paper is concerned with factors affecting a farmer's decision concerning the timing of Nitrogen ferilizer application. These factors include the expected Nitrogen loss associated with different application times, the expected seasonal fluctuations in Nitrogen Fertilizer prices and operating costs, and the perceived risk of not being able to apply Nitrogen Fertilizer during the growing season. This paper shows that a split application of Nitrogen Fertilizer is an optimal strategy for both risk-neutral and risk-averse cotton farmers in the United States if there is a possibility that they may be unable to apply Nitrogen Fertilizer after planting. Furthermore, a risk-averse cotton farmer relative to a risk neutral farmer will apply more Nitrogen Fertilizer prior to planting.
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Timing Nitrogen Fertilizer Applications To Improve Water Quality
Staff Reports, 1994Co-Authors: Wen Yuan Huang, Noel D. Uri, Leroy T. HansenAbstract:roper timing of the application of Nitrogen Fertilizer can be an effective tool to reduce Nitrogen losses. This report is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. Analytical models are developed to determine the necessary conditions for the optimal timing of the application of Nitrogen Fertilizer. The models, coupled with an estimated cotton yield function, are used to assess a farmer's decision on the optimal application timing of Nitrogen Fertilizer in cotton production. The empirical results explain various observed application timings of Nitrogen Fertilizer being used in cotton production in Mississippi, and provide an estimate of the cost to a farmer complying with a restriction on the timing of Nitrogen Fertilizer application.
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Assessing a farmer's decision concerning the application timing of Nitrogen Fertilizer
Environmental Geology, 1994Co-Authors: Wen Yuan Huang, Noel D. Uri, L. HansenAbstract:This paper is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. Analytical models are developed to determine the necessary conditions for the optimal timing of the application of Nitrogen Fertilizer. The models, coupled with an estimated cotton yield function, are used to assess a farmer's decision on the optimal application timing of Nitrogen Fertilizer in cotton production. The empirical results explain various observed application timings of Nitrogen Fertilizer being used in cotton production in Mississippi, USA, and provide an estimate of the cost to a farmer when he or she must comply with a restriction on the timing of the application of Nitrogen Fertilizer.
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Nitrogen Fertilizer application timing: A decision theoretic approach for United States cotton
Oxford Agrarian Studies, 1993Co-Authors: Wen Yuan Huang, Leroy T. Hansen, Noel D. UriAbstract:Abstract This paper is concerned with a farmer's decision on the timing of Nitrogen Fertilizer application. It shows that for dryland cotton production, a split application of Nitrogen Fertilizer whereby some Fertilizer is applied before and some after planting is the optimal strategy. Additionally, a risk‐averse cotton farmer, as compared to a risk‐neutral farmer, will apply more Nitrogen Fertilizer prior to planting. Finally, for irrigated cotton, the application of Nitrogen Fertilizer during the growing season is the optimal strategy. The results of the analysis explain the observed Nitrogen Fertilizer timing decision of cotton farmers.
Philip Hugenholtz - One of the best experts on this subject based on the ideXlab platform.
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The core root microbiome of sugarcanes cultivated under varying Nitrogen Fertilizer application.
Environmental microbiology, 2015Co-Authors: Yun Kit Yeoh, Chanyarat Paungfoo-lonhienne, Nicole Robinson, Mark A. Ragan, Susanne Schmidt, Paul G. Dennis, Philip HugenholtzAbstract:Diazotrophic bacteria potentially supply substantial amounts of biologically fixed Nitrogen to crops, but their occurrence may be suppressed by high Nitrogen Fertilizer application. Here, we explored the impact of high Nitrogen Fertilizer rates on the presence of diazotrophs in field-grown sugarcane with industry-standard or reduced Nitrogen Fertilizer application. Despite large differences in soil microbial communities between test sites, a core sugarcane root microbiome was identified. The sugarcane root-enriched core taxa overlap with those of Arabidopsis thaliana raising the possibility that certain bacterial families have had long association with plants. Reduced Nitrogen Fertilizer application had remarkably little effect on the core root microbiome and did not increase the relative abundance of root-associated diazotrophs or nif gene counts. Correspondingly, low Nitrogen Fertilizer crops had lower biomass and Nitrogen content, reflecting a lack of major input of biologically fixed Nitrogen, indicating that manipulating Nitrogen Fertilizer rates does not improve sugarcane yields by enriching diazotrophic populations under the test conditions. Standard Nitrogen Fertilizer crops had improved biomass and Nitrogen content, and corresponding soils had higher abundances of nitrification and denitrification genes. These findings highlight that achieving a balance in maximizing crop yields and minimizing nutrient pollution associated with Nitrogen Fertilizer application requires understanding of how microbial communities respond to Fertilizer use.
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Nitrogen Fertilizer dose alters fungal communities in sugarcane soil and rhizosphere
Scientific reports, 2015Co-Authors: Chanyarat Paungfoo-lonhienne, Yun Kit Yeoh, Naga Rup Pinaki Kasinadhuni, Thierry G. A. Lonhienne, Nicole Robinson, Philip Hugenholtz, Mark A. Ragan, Susanne SchmidtAbstract:Fungi play important roles as decomposers, plant symbionts and pathogens in soils. The structure of fungal communities in the rhizosphere is the result of complex interactions among selection factors that may favour beneficial or detrimental relationships. Using culture-independent fungal community profiling, we have investigated the effects of Nitrogen Fertilizer dosage on fungal communities in soil and rhizosphere of field-grown sugarcane. The results show that the concentration of Nitrogen Fertilizer strongly modifies the composition but not the taxon richness of fungal communities in soil and rhizosphere. Increased Nitrogen Fertilizer dosage has a potential negative impact on carbon cycling in soil and promotes fungal genera with known pathogenic traits, uncovering a negative effect of intensive fertilization.
Yun Kit Yeoh - One of the best experts on this subject based on the ideXlab platform.
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The core root microbiome of sugarcanes cultivated under varying Nitrogen Fertilizer application.
Environmental microbiology, 2015Co-Authors: Yun Kit Yeoh, Chanyarat Paungfoo-lonhienne, Nicole Robinson, Mark A. Ragan, Susanne Schmidt, Paul G. Dennis, Philip HugenholtzAbstract:Diazotrophic bacteria potentially supply substantial amounts of biologically fixed Nitrogen to crops, but their occurrence may be suppressed by high Nitrogen Fertilizer application. Here, we explored the impact of high Nitrogen Fertilizer rates on the presence of diazotrophs in field-grown sugarcane with industry-standard or reduced Nitrogen Fertilizer application. Despite large differences in soil microbial communities between test sites, a core sugarcane root microbiome was identified. The sugarcane root-enriched core taxa overlap with those of Arabidopsis thaliana raising the possibility that certain bacterial families have had long association with plants. Reduced Nitrogen Fertilizer application had remarkably little effect on the core root microbiome and did not increase the relative abundance of root-associated diazotrophs or nif gene counts. Correspondingly, low Nitrogen Fertilizer crops had lower biomass and Nitrogen content, reflecting a lack of major input of biologically fixed Nitrogen, indicating that manipulating Nitrogen Fertilizer rates does not improve sugarcane yields by enriching diazotrophic populations under the test conditions. Standard Nitrogen Fertilizer crops had improved biomass and Nitrogen content, and corresponding soils had higher abundances of nitrification and denitrification genes. These findings highlight that achieving a balance in maximizing crop yields and minimizing nutrient pollution associated with Nitrogen Fertilizer application requires understanding of how microbial communities respond to Fertilizer use.
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Nitrogen Fertilizer dose alters fungal communities in sugarcane soil and rhizosphere
Scientific reports, 2015Co-Authors: Chanyarat Paungfoo-lonhienne, Yun Kit Yeoh, Naga Rup Pinaki Kasinadhuni, Thierry G. A. Lonhienne, Nicole Robinson, Philip Hugenholtz, Mark A. Ragan, Susanne SchmidtAbstract:Fungi play important roles as decomposers, plant symbionts and pathogens in soils. The structure of fungal communities in the rhizosphere is the result of complex interactions among selection factors that may favour beneficial or detrimental relationships. Using culture-independent fungal community profiling, we have investigated the effects of Nitrogen Fertilizer dosage on fungal communities in soil and rhizosphere of field-grown sugarcane. The results show that the concentration of Nitrogen Fertilizer strongly modifies the composition but not the taxon richness of fungal communities in soil and rhizosphere. Increased Nitrogen Fertilizer dosage has a potential negative impact on carbon cycling in soil and promotes fungal genera with known pathogenic traits, uncovering a negative effect of intensive fertilization.
Susanne Schmidt - One of the best experts on this subject based on the ideXlab platform.
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The core root microbiome of sugarcanes cultivated under varying Nitrogen Fertilizer application.
Environmental microbiology, 2015Co-Authors: Yun Kit Yeoh, Chanyarat Paungfoo-lonhienne, Nicole Robinson, Mark A. Ragan, Susanne Schmidt, Paul G. Dennis, Philip HugenholtzAbstract:Diazotrophic bacteria potentially supply substantial amounts of biologically fixed Nitrogen to crops, but their occurrence may be suppressed by high Nitrogen Fertilizer application. Here, we explored the impact of high Nitrogen Fertilizer rates on the presence of diazotrophs in field-grown sugarcane with industry-standard or reduced Nitrogen Fertilizer application. Despite large differences in soil microbial communities between test sites, a core sugarcane root microbiome was identified. The sugarcane root-enriched core taxa overlap with those of Arabidopsis thaliana raising the possibility that certain bacterial families have had long association with plants. Reduced Nitrogen Fertilizer application had remarkably little effect on the core root microbiome and did not increase the relative abundance of root-associated diazotrophs or nif gene counts. Correspondingly, low Nitrogen Fertilizer crops had lower biomass and Nitrogen content, reflecting a lack of major input of biologically fixed Nitrogen, indicating that manipulating Nitrogen Fertilizer rates does not improve sugarcane yields by enriching diazotrophic populations under the test conditions. Standard Nitrogen Fertilizer crops had improved biomass and Nitrogen content, and corresponding soils had higher abundances of nitrification and denitrification genes. These findings highlight that achieving a balance in maximizing crop yields and minimizing nutrient pollution associated with Nitrogen Fertilizer application requires understanding of how microbial communities respond to Fertilizer use.
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Nitrogen Fertilizer dose alters fungal communities in sugarcane soil and rhizosphere
Scientific reports, 2015Co-Authors: Chanyarat Paungfoo-lonhienne, Yun Kit Yeoh, Naga Rup Pinaki Kasinadhuni, Thierry G. A. Lonhienne, Nicole Robinson, Philip Hugenholtz, Mark A. Ragan, Susanne SchmidtAbstract:Fungi play important roles as decomposers, plant symbionts and pathogens in soils. The structure of fungal communities in the rhizosphere is the result of complex interactions among selection factors that may favour beneficial or detrimental relationships. Using culture-independent fungal community profiling, we have investigated the effects of Nitrogen Fertilizer dosage on fungal communities in soil and rhizosphere of field-grown sugarcane. The results show that the concentration of Nitrogen Fertilizer strongly modifies the composition but not the taxon richness of fungal communities in soil and rhizosphere. Increased Nitrogen Fertilizer dosage has a potential negative impact on carbon cycling in soil and promotes fungal genera with known pathogenic traits, uncovering a negative effect of intensive fertilization.
