Design And Application Of Fertilization Information System For Farmland On Village Level In Purple Hilly Area

On the basic research of the spatial variability of soil available nutrients in farmland and fertilization model, fertilization information system for farmland on village level in purple hilly area was developed based on the soil texting, and principle of fertilization effect, by inserting ArcGIS Engine component into the Visual Studio 2008 development environment and combining the techniques of relational database and ComGIS. This system directly served to farmers and agricultural departments, and realized the functions as basic map operation, farmland information query, soil nutrient assessment, fertilization recommendation, user management and result output and so on. Case studying on the Paofang village and Dashui village of Qianwei county in Sichuan Province, the system can effectively manage regional agriculture spatial information and show a good applicability in future. The main results are as follow:1. Three kinds of soil available nutrient in farmland on village level obeyed the normal distribution or the logarithmic normal distribution. Soil available N, P, K mean contents was 94 mg of N/kg of soil,10 mg of P/kg of soil,96 mg of K/kg of soil, and their variation coefficient values were from 30% to 60% belonging to moderate variation strength. The rates of nugget to sill were all above 85%, that indicated soil available N, P, K had weak spatial correlation and they were mainly caused by random factor. Compared with Qianwei county, soil available N, P in farmland soil on village level were lower than the county average, and soil available K was higher than the county average. Meanwhile, compared with the second soil survey in Qianwei county, three kinds of soil available nutrient in farmland on village level had relatively substantially raise. From their space distribution, the high value region was distributed mainly in Paofang village, and the low value region was distributed mainly in Dashui village. Three kinds of soil available nutrient in farmland on village level appeared the two status of shortage and midding. However, they appeared only one status due to larger spatial distances in the seat of two villages in Qianwei county.2. From the two aspects of fertilizer and model parameters, this paper analyzed comparatively three fertilization models of production targeted, fertilizer response function and difference adjustment. The fertilizers calculated by the model of fertilizer response function based on the logarithms models between soil available nutrients content and optimum amount of fertilization in the middle of Sichuan hilly regions, were closer to the local experience fertilizers. The models of production targeted and difference adjustment calculated some inaccurate and unscientific fertilizers due to low accuracy and difficult to obtain. So the model of fertilizer response function suited the study region using most.3. Based on Microsoft SQL server 2005 for data management, this system developed in the Visual Studio 2008 development environment, using three-layers system construction modes and inserting ArcGIS Engine component. This system had friendly and beautiful interface, and was easy to comprehension and operation. Realized the assessment of soil available N, P, K, the fertilization recommendation of three crops, and the best fertilization program making, it reached the goal of farmland precision fertilization, and provided the technical guidance to scientific fertilization in purple hilly.