Abstract
The SWATNIT model [26], predicting water and nitrogen transport in cropped soils, was evaluated on experimental data of winter wheat for different N treatments. The experiments were monitored at three different locations on different soil types in the Netherlands. Crop growth was simulated using the SUCROS model [11] which was integrated in the SWATNIT model. Both water and nitrogen stress were incorporated. Except for the soil hydraulic properties, all model parameters were taken from literature. The model performance was evaluated on its capability to predict soil moisture profiles, nitrate and ammonia profiles, the time course of simulated total dry matter production and LAI; and crop N-uptake. Results for the simulations of the soil moisture profile indicate that the soil hydraulic properties did not reflect the actual physical behaviour of the soil with respect to soil moisture. Good agreement is found between the measured and simulated nitrate and ammonia profiles. The simulation of the nitrate content of the top layer at Bouwing was improved by increasing the NH4 +-N-distribution coefficient thereby improving the simulation of the NH4 +-N-content in this layer. Deviations between simulated and measured nitrate concentrations also occurred in the bottom layers (60–100 cm) of the soil profile. The phreatic ground water might influence the nitrate concentrations in the bottom layers. Concerning crop growth modelling, improvements are needed with respect to the partitioning of total dry matter production over the different plant organs in function of the stress, the calculation of the nitrogen stress and the total nitrogen uptake of the crop through a better estimate of the N-demand of the different plant organs.
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Vereecken, H., Vanclooster, M., Swerts, M., Diels, J. (1991). Simulating water and nitrogen behaviour in soils cropped with winter wheat. In: Groot, J.J.R., De Willigen, P., Verberne, E.L.J. (eds) Nitrogen Turnover in the Soil-Crop System. Developments in Plant and Soil Sciences, vol 44. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3434-7_9
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DOI: https://doi.org/10.1007/978-94-011-3434-7_9
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