关键词: 苏云金芽孢杆菌, 苏云金芽孢杆菌, 诱变育种, 生物农药

Abstract:

Abstract :soil clay content, bulk density, pH, organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, available potassium these 10 indicators are selected to build model by fuzzy mathematical method to determine their membership function and process. The weight of each indicator was built by PCA. And Integrated Fertility Index (IFI) can be calculated by this model. The application suggestion including raising organic fertilizer amount for lower fertility soils , applying phosphorus fertilizer in the right amounts during the the growth period of crops,and Targeted application of nitrogen and potash fertilizer is put forward according to the evaluation results of soil fertility.