DIGITAL SIMULATION OF FERTILISER MANAGEMENT IN A REFINED AGRICULTURE-BASED PADDY FIELD

摘要

Food shortage is an urgent problem worldwide. However, uncontrolled use of fertiliser for increasing crop yields not only results in energy waste but exacerbates groundwater contamination. For example, chemical fertilisers administered to paddy fields during growing seasons can generate nitrate nitrogen during nitrogen transformation. This chemical then seeps into groundwater or enters other surface water bodies via runoff or drainage, thus becoming the main source of pollution to groundwater. In this study, a coupled soil water and nitrogen balance model was employed to digitally simulate the mechanisms spanning from hydrolysis of nitrogen fertilisers to absorption by plants. Subsequently, the simulation results were compared with the test data from the farm of the India Agricultural Research Institute in New Delhi. In the comparison, the calculations and measured data shared great similarities in plant uptake of nitrogen, nitrogen left in the soil, and nitrogen volatilisation. These results indicated that the digital simulation model adopted in this study can be applied to digital management in refined agriculture and used as a reference for effective fertiliser management and nonpoint source pollution control.