The application and analysis of rice-growth model for organic rice fertilization management

The rational input of materials is one of the key techniques to realize the comprehensive benefits of an agro-ecological engineering mode and is an important element of the hardware of an ecological engineering. The calculation of fertilizer application rate is the common difficulty for farmers in planting organic rice, for which the model of an optimum fertilizer application was applied and the corresponding field verification experiment was also carried out. The results showed that the calculated yields were quite close to the actual ones by the selected model, although the actual yields were all higher. So adding a constant K adjusting N supply to the model was set forth in order to improve the accuracy of forecasting yields. The field experiment showed that if the green manure grew well, no application, the occurrence of diseases and pests (except rice leaf rollers) did not become heavier with more organic N input, and the resistance to white-backed plant hoppers became higher with more organic N input. The test of the rice quality showed that the organic rice quality was quite stable and rarely impacted by different N input levels.