GIS-based Spatial Analysis And Fertilizer Recommendation Model Of Mountain Soil Nutrients For Tobacco Field In Chong Qing

In order to further improve the management of tobacco field slope and thequality of tobacco, regional study was carried out in Chongqing Pengshui TobaccoScience and Technology Demonstration Park. Typical characteristics of mountainslopes planting tobacco spatial variability of soil available nutrients and distributioncharacteristics was studied. The results showed that, available phosphorus of the soilof study area is lower levels, available potassium and substitution of manganese arehigher levels, OM and AN is appropriate, soil is acidic. Available copper is moderatelevel and it is more appropriate for tobacco growth; The average content of availableiron and zinc which is a relatively rich level in line with the mountain soil nutrient are35.72mg/kg,3.44mg/kg; Substitution of manganese is slightly higher and a largerrange, easily leading to the hazards of manganese, resulting in the tobacco bottom leaf;The Spatial variability of AN, AK, OM, Cu are medium, AP, Fe, Mn and Zn are strongvariation, CV of AP is35.49%, and CV of AK is17.65%.Characteristics of tobacco-growing areas by mountain slopes tobacco plantingsoil parent material, topography and other factors, AP, AK, Mn, Cu and Zn havestrong spatial correlation, effected by characteristics of mountain slopes plantingtobacco smoke zone soil parent material, topography and other factors. And pH,organic matter, nitrogen, and the available iron has a moderate spatial variability, thisis shown that spatial variability by random factors and human factors affect the spatialvariability of soil properties and spatial structure.Determination coefficients of AP andAK is0.362and0.404. The goodness of model is low, the spatial variation structure ispoor, the spatial correlation is small-block variation, the spatial autocorrelation issmaller, spatial variability structure of AN and OM is significant, showing regionalization, regularity and consistency. The content of available Fe, Mn, Cu, Znand pH show certain regularity with the slope. The spatial distribution of tobacco soilnutrients of slopes intuitively characterized by Kriging inter-polation.The study in tobacco field soil nutrient management zones shows that themanagement area of the partitions is3combined. Stepwise regression analysis andfuzzy c-means clustering algorithm with the fuzzy performance index and normalizedclassification entropy. The nutrient in different partition is homogeneity andcoefficients of determination.Based on field trials in2010and2011, Truog-Stanford parameters are required,then chose the power function curve which coefficients of determination（R2）is thehighest through measured values of soil nutrients and nutrient correction factor for thefitting of the curve equation. In this condition, It is consistent with actual productionfact that soil nutrient correction factor decreases with the increase of nutrientdetermination. The recommended fertilization model of nitrogen, phosphorus, potashis initial establishment through the equation calculated by the amount of appliedfertilizer (nutrients). It is laid on the foundation in the implementation of the precisefertilization tobacco and differences in the management, and has a great significancefor modern tobacco agriculture.