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Modelling diverse root density dynamics and deep nitrogen uptake Organic Eprints
Pedersen, Anders; Zhang, Kefeng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann.
We present a 2-D model for simulation of root density and plant nitrogen (N) uptake for crops grown in agricultural systems, based on a modification of the root density equation originally proposed by Gerwitz and Page (1974). A root system form parameter was introduced to describe the distribution of root length vertically and horizontally in the soil profile. The form parameter can vary from 0 where root density is evenly distributed through the soil profile, to 8 where practically all roots are found near the surface. The root model has other components describing root features, such as specific root length and plant N uptake kinetics. The same approach is used to distribute root length horizontally, allowing simulation of root growth and plant N uptake...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Farm nutrient management; Air and water emissions.
Ano: 2009 URL: http://orgprints.org/16106/1/16106.pdf
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Simulating Root Density Dynamics and Nitrogen Uptake – Can a Simple Approach be Sufficient? Organic Eprints
Pedersen, Anders; Zhang, Kefeng; Jensen, Lars Stoumann; Thorup-Kristensen, Kristian.
The modeling of root growth in many plant–soil models is simple and with few possibilities to adapt simulated root proliferation and depth distribution to that actually found with different crop species. Here we propose a root model, developed to describe root growth, root density and nitrogen uptake. The model focuses on annual crops, and attempts to model root growth of different crop species and row crops and its significance for nitrogen uptake from different parts of the soil volume.
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Crop combinations and interactions; Root crops; Farm nutrient management; Vegetables.
Ano: 2007 URL: http://orgprints.org/10744/1/10744.pdf
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Simulating Root Density Dynamics and Nitrogen Uptake -Field Trials and Root Model Approach in Denmark Organic Eprints
Pedersen, Anders; Zhang, Kefeng; Jensen, Lars Stoumann; Thorup-Kristensen, Kristian.
Plant soil and atmosphere models are commonly used to predict crop yield and associated environmental consequences. Such models often include complex modelling of water movement, soil organic matter turnover and above ground plant growth. However, the root modelling in these models is often very simple, partly due to a limited access to experimental data. Here we propose a root model developed to describe root growth, root density and nitrogen uptake. The model focuses on annual crops, and attempts to model root growth of different crop species and row crops and its significance for nitrogen uptake from different parts of the soil volume.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop combinations and interactions; Biodiversity and ecosystem services.
Ano: 2007 URL: http://orgprints.org/10745/1/10745.pdf
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Simulating root density dynamics and nitrogen uptake in the soil profile – A simple approach Organic Eprints
Pedersen, Anders; Zhang, Kefeng; Thorup-Kristensen, Kristian; Jensen, Lars S..
We present a 2-D model for simulation of root density and nitrogen (N) uptake for crops grown in agricultural systems, based on a modification of Gerwitz and Page’s root density calculation. A root system form parameter was used to describe the distribution of root biomass vertically and horizontal in the soil profile. The form parameter can vary from 0 where root density is evenly distributed in the soil profile, to 8 where practically all roots are found near the surface. Additionally, the root model has other components describing root features, such as specific root length, N uptake kinetics. The root penetration rate and the depth distribution of root density were found to be the most important parameters controlling crop N uptake from deeper soil...
Tipo: Working paper Palavras-chave: Nutrient turnover; Crop combinations and interactions; Root crops; Farm nutrient management; Vegetables.
Ano: 2007 URL: http://orgprints.org/11361/1/Rodmodel_Artikel_Org_eprint.pdf
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The use of computer modelling to evaluate the agronomic, economic and environmental impacts of N management in contrasting organic rotations Organic Eprints
Rayns, Francis; Schmutz, Ulrich; Firth, Chris; Thorup-Kristensen, Kristian; Zhang, Kefeng; Rahn, Clive.
A new computer model (EU-ROTATE_N) has been developed with the aim of improving nitrogen management on all farms across Europe which include fi eld vegetables in their rotations. It brings together aspects of many existing models and contains a number of features to make it applicable to organic producers (e.g. taking account of nitrogen fixation by legume containing leys, nitrogen conservation by winter cover crops and nitrogen supply by manures and composts). A key feature is the model’s ability to simulate economic output and this enables it to be of value to policy makers when considering the impact of new measures to reduce environmental pollution. This paper describes the model and some initial work that has been conducted to evaluate it under UK...
Tipo: Conference paper, poster, etc. Palavras-chave: Farm nutrient management; Vegetables; Farm economics.
Ano: 2006 URL: http://orgprints.org/10215/1/10215.pdf
Registros recuperados: 5
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