Regionalized Fertilization And Spatial Variation Of Soil Nutrition For Crop Of Dingxing

Soil testing formula fertilization is based on soil testing and fertilizer fieldexperiment, according to the crop fertilizer rule, soil supplying nutrient capability andfertilizer effect performance, which is on the basis of reasonable application oforganic fertilizers, that find out fertilizer application quantity, Fertilization period andapplication method of N, P, K and secondary and micro-nutrients. Not only it canimprove the fertilizer use efficiency, increase crop yields, rotect agriculturalecological environment, but also it can improve the quality of agricultural products,build up soil fertility, reduce production cost to guide farmers to scientific andreasonable fertilization and realize the sustainable development of agriculture. Soilnutrient spatial pattern and temporal evolution was found out by collecting soil point,testresults of nutrients and all kinds of maps and so on in this study based on Dingxingcounty. Set up regression model between various fertilization and crop yields, todetermine the rational fertilization scheme, through winter wheat and corn fieldexperiment of fertilizer effect of "3414" in various fertilizer use. According to the Soilnutrient spatial pattern and temporal evolution of Dingxing, the demand law of differentcrops and target output, illustrated the different regions of the county adaptivepartition fertilization scheme and recommended fertilization. The main results were asfollows:1. Investigate Dingxing County soil fertility clear. Average values of soil organicmatter, available N, available P, available K, available Fe, available Mn, available Cu,available Zn were16.25g/kg，93.99mg/kg，20.33mg/kg，81.72mg/kg，15.0mg/kg，20.8mg/kg，1.7mg/kg and1.4mg/kg. Available P, available Fe, available Mn,available Cu, available Zn were belong to secondary level, organic matter, availablepotassium were belong to fourth level, available nitrogen was belong to third level. Sothe soil macro-nutrients were in the middle or average level, and micronutrient werein higher level.2. Found out the space-time evolution of soil nutrients. Compared with thesecond national soil survey data, the average content of organic matter, available N,available P, available Fe, available Mn, available Cu, available Zn increased by 84.6%、145.0%、446.0%、63.2%、365.0%、56.0%、204.0%; available K reduced by12.5%.3. Soil organic matter rose from the level five to the level four, with alkalinehydrolysis nitrogen from five to three and four, and the content of effective Fe、effective Mn and effective Cu all rose from mainly level three to the level two witheffective Zn from four to two. The nutrient content level of soil available K did’tchange while the proportion that level four accounting for the total arable landdecreased. The result showed a variety of large and medium micronutrients in the soilwere evolved over time and showed an increasing trend except available K. Thefarmland that close to village whose soil nutrient content were higher than those faraway from it. N, P, K spatial distribution map showed a trend that the nutrient contentin surrounding area is higher than in the middle region.4. According to the "3414" experiment of winter wheat and summer maize,established the regression model between fertilizer in different soil fertility and twokind of crop yield. Calculated the nitrogen phosphorus potassium fertilizerapplication and economic optimum application rates when its was in the highest yield.Basis on the status and distribution of soil nutrients, temporal evolution, crop fertilizerapplication features and target yield, found out the different soil fertility condition ofwinter wheat and summer maize recommended fertilization of N, P, K fertilizer.According to all kinds of soil nutrient supply capacity of different regions drawnthe winter wheat and summer maize, N, P, K fertilization zoning map to guide thefarmers according to distribution according to need to determine a reasonable amountof fertilizer and fertilizer measures.