A Web Application for Soil Nitrogen Balance Estimation

摘要

To support rational fertilization management on vegetable farms, we developed a Web application, Soil Nitrogen Balance Estimation System to estimate the soil mineral nitrogen balance in response to fertilizer applications, cropping, soil conditions, and climate conditions. The system comprises of soil nitrogen dynamic models, a database of N-mineralization parameters in soils and organic fertilizers, a database of crop N-absorption parameters, an AMeDAS climate database, and Web interface programs. The soil nitrogen dynamic models comprises of N- mineralization models, a crop N-absorption model, and a soil N-leaching model. Two versions of Web interface programs were developed. In the simple version, users can run the models easily by entering an AMeDAS point, a crop, cropping period, amount of fertilizers, and a soil group. In the detail version, users can enter optional parameter values for the soil nitrogen dynamic models. The system is open to the public on WWW. Now, in cooperation with prefectural researchers, system improvement and data collection are being continued.