Specific Index System of Ecological Balanced Fertilization for Rice.

This paper studied the nitrogen index system of ecological balanced fertilization for rice by data mining method based on data of" 3414 fertilizer field trials" of rice by published papers from national soil testing and recommendation since 2005. The results and conclusions were as follows. (D Soil nutrient content could not be used as fertilization indicator of rice. @The conceptual model of nitrogen conversion rate of rice for plot was YN =a+ b X optimum production - c X optimum nitrogen fertilization amount - d X optimum phosphorus fertilization amount, and the conceptual model of phosphorus conversion rate was Yp =a - bx optimum phosphorus fertilization amount - c x optimum potassium fertilization amount, and the conceptual model of potassium conversion rate was YK =a+ b X optimum production+ c X optimum nitrogen fertilization amount - d X optimum potassium fertilization amount - e x annual average precipitation. @ The conceptual model of the optimum nitrogen fertilization amount of rice for plot was YN =a + b x optimum production +c Xoptimum phosphorus fertilization amount -d X annual average precipitation, and the conceptual model of the optimum phosphorus fertilization amount was YP =a + b x optimum nitrogen fertilization amount + c x optimum potassium fertilization amount, and the conceptual model of the optimum potassium fertilization amount was YK =a + b X optimum phosphorus fertilization amount + c X annual average precipitation. @The conceptual model of relative abundance - deficiency value of soil nitrogen of rice for plot was YN =a - b x optimum nitrogen fertilization amount - c x optimum potassium fertilization amount, and the conceptual model of relative abundance - deficiency value of soil phosphorus was Yp =a + b x soil available potassium - c x optimum potassium fertilization amount, and the conceptual model of relative abundance - deficiency value of soil potassium of rice was YK =a - b X optimum potassium fertilization amount. [ABSTRACT FROM AUTHOR]