基于RCSODS的有机水稻栽培施肥管理与效果分析

The application of RCSODS model to fertilization practice of organic rice and its effect analysis

利用RCSODS的最佳施肥决策模型对有机水稻生产的施肥量和产量进行了测算和试验验证。结果表明:利用模型预测的产量与实收产量有较好的一致性,但实收产量普遍高于预测产量。故提出模型中需要增加一个供N调整常数K,以提高模型预测的精度。田间试验表明在绿肥生长良好的情况下,不再施肥不会对水稻的产量产生实质性的影响。除稻纵卷叶螟外,病虫害没有产生随施N量的增加而加重为害的现象,相反对白背飞虱的抗性有随施N量增加而增强的趋势。稻谷检测结果表明,有机稻谷质量表现出较好的稳定性,整体受施N水平的影响很小。

The calculation of the fertilizer application rate and yield of organic rice production was made according to the RCSODS model of an optimum fertilizer application, and the corresponding field experiment was also carried out. The results showed that the calculated yields were quite close to the actual ones, although the actual yields were all higher. So adding a constant K of 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 crop grew well, no application of organic fertilizer had not any significant impact on the yield. The damage by diseases and pests （ except rice leaf rollers） did not become heavier with more N input, and the resistance to white-backed planthoppers became higher with more N input. The test for the rice quality showed that the organic rice quality was quite stable and rarely impacted by different N inputs.