Modeling long-term crop response to fertilizer and soil nitrogen

Springer Science and Business Media LLC - Tập 120 - Trang 23-38
H. Van Keulen1,2, J. Wolf3,2
1Centre for World Food Studies, c/o CABO, Wageningen, The Netherlands
2CABO, Wageningen, The Netherlands
3Centre for World Food Studies, c/o CABO, Wageningen, the Netherlands

Tóm tắt

Results from a simple model for computing long-term changes in soil organic nitrogen and crop uptake and crop recovery of nitrogen applications were compared with results of previously published long-term field trials. In these trials a rotation of sugar beet, barley, potatoes and wheat was practiced in the German Democratic Republic and continuous production of wheat and rice in the United Kingdom and Japan, respectively. The agreement between observed values for the change in soil nitrogen and nitrogen uptake and the computed values is in general satisfactory. The number of input data required for application of the model is kept as restricted as possible. Nevertheless, part of the required information may not be available in many situations. The quality of the predictions of the model will then be limited particularly by the lack of suitable input data.

Tài liệu tham khảo

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