Characteristics Of Cultivated Land Fertility And Development Of Fertilization Decision System In Anhua County

The research of this topic is based on the promotion project of soil testing and formulated fertilization in Hunan province,aiming at the situation of cultivated land fertility in Anhua county,the research and establishment of the soil testing and formulated fertilization decision system are completed.On the basis of collecting and sorting out the relevant data and data related to the subject research,the software tools such as Arc GIS,Map GIS and farmland resource management information system are comprehensively used to study and analyze the relevant data and data.Then,the establishment of the evaluation model is completed with the help of the expert system of soil testing and formulated fertilization.With this model as a tool,the characteristics of farmland productivity in Anhua County are studied and analyzed.On the basis of clarifying the local soil characteristics,the optimal conditions for rice planting are discussed and analyzed,so as to realize the functional demonstration and technical popularization of the expert system of soil testing and formulated fertilization.Specifically,the following conclusions are obtained:(1)Distribution characteristics of soil fertility: the area of primary land is 723.18hm2,accounting for 1.5% of cultivated land area;The area of secondary land is 6866.25hm2,accounting for 14.4% of the cultivated land.The area of Grade III is 8908.38hm2,accounting for 18.7%,the area of Grade IV is 11707.65hm2,accounting for 24.6%,the area of Grade V is 10770.30hm2,accounting for 22.6%,while the areas of Grade VI and Grade VII are 6449.99hm2 and 2234.25hm2,accounting for 13.5% and 4.7% respectively.(2)Taking the expert system of soil testing and formula fertilization as the basic tool,based on the comprehensive consideration of soil fertility characteristics and field test results in Anhua County,the corresponding rice fertilization index system was constructed,and the formula results obtained were 15:6:9,20:8:12,22:10:16,22:6:12.Then further discuss the specific content of analysis of fertility parameters,analysis models,membership functions and other elements,so as to provide sufficient and reliable data information basis for the construction of rice soil testing and formula fertilization expert system and fully ensure the reliability and scientificity of the system.(3)The function and effect of inquiring the soil testing and formula fertilization scheme of Anhua through the touch screen system are realized.On the basis of giving full play to the functions of software tools such as Map GIS and Arc GIS,this paper discusses the specific methods of using touch screen tools,and analyzes and discusses their technical processes.