Abstract:

This paper chosen the main influence factors of soil nutrients including total nitrogen, organic matter, available phosphorus, available potassium and two kinds of trace elements zinc and boron these 6 indicators were selected to build model by fuzzy mathematical method to determine their membership function and process. The weight of each indicator was determined by the "Expert Grading System". And Integrated Soil Nutrient Status of each county (district) could be calculated by using the result of fuzzy evaluation. Results show that Integrated Soil Nutrient Status of Guichi and Lujiang County (District) belonged to second stage, being higher level; Feidong, Wuwei and Juchao County (District) belonged to third stage , being secondary level; Mingguang County (District) belong to forth stage , being lower level. In addition, comparing the results of fuzzy evaluation with exponential sum method was consistent. These two kinds of methods could be used for soil nutrient comprehensive evaluation.