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Modelling crop root development and nitrate uptake

Pedersen, Anders (2008) Modelling crop root development and nitrate uptake. Thesis, The Faculty of Life Sciences, University of Copenhagen, Department of Agricultural Sciences. . [Unpublished]

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Summary

Nitrate leaching from agricultural areas is a political and environmental issue at both local scale in Denmark and at global scale. Plant-available nitrogen and nitrate in the rooting zone in the growing season is necessary in order to obtain satisfactory crop yields. However, surplus nitrogen leads to a risk of nitrate losses through leaching and denitrification. In addition to artificial applications of nitrate, nitrate is produced by mineralisation processes in the soil from plant residues and soil organic matter and by nitrification. Therefore nitrate losses can be difficult to control. This thesis investigates root growth in arable and vegetable crops through construction and improvement of existing models for determining root growth and associated N uptake. The models provide an insight into nitrate dynamics in the soil matrix, and can be used to predict plant yield and N uptake and changes in different soil N pools. Here, the models were used for analysing different physical and biological processes in soil. This was combined with analysis of model construction and parameterisation of crop modules, root sub-modules and soil organic matter pools for predicting nitrate leaching and retention.


EPrint Type:Thesis
Thesis Type:Ph.D. thesis
Keywords:Modelling root growth, nitrate leaching, catch crops, Daisy model, EU-rotate_N model
Subjects: Soil > Nutrient turnover
Crop husbandry > Production systems > Cereals, pulses and oilseeds
Crop husbandry > Crop combinations and interactions
Crop husbandry > Production systems > Root crops
Farming Systems > Farm nutrient management
Crop husbandry > Production systems > Vegetables
Environmental aspects > Air and water emissions
Research affiliation: Denmark > DARCOF II (2000-2005) > I. 3 (BIOMOD) Interaction between nitrogen dynamics, crop production and biodiversity
Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops
Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Denmark > SOAR - Research School for Organic Agriculture and Food Systems
Denmark > KU-LIFE - Faculty of Life Sciences
Deposited By: Pedersen, Ph.Stud. Anders
ID Code:13453
Deposited On:06 May 2008
Last Modified:03 Jul 2012 12:24
Document Language:English
Status:Unpublished
Refereed:Not peer-reviewed

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