Evaluation of Nutrient elements Distribution in Soil to Optimize Fertilizer’s Consumption by Wheat Cultivation

In this research, the spatial distribution of nitrogen, phosphorus and potassium on agricultural lands in Jolge Rokh, Torbat-e-Heydarieh county, Khorasan-e-Razavi province was evaluated using the Geo-statistics. Thus, over 100 soil samples were collected from fields. The values of these parameters were measured for each sample in the soil lab. Evaluation criteria in this study were the mean absolute error and the second root mean square of the residual error using the mutual evaluation validation method. variogram the draw for all elements. After estimating semi variogram model, the validation of the fitted pattern was done by estimating the error. After approving the Variogram, the Kriging interpolation function was applied to map the distribution of the nutrient elements in the study area. Our results revealed that the nutrient elements had different spatial distribution in the plain. The percent of soil organic carbon in 90% of the study area was lower than the critical limits of nitrogen and the values of available Phosphorous and potassium were respectively in 32.2% and 46% of the lands were higher than the critical limits of nitrogen. In general, mapping nutrient elements distribution by Geo-statistical procedures is known as applicable tool in demonstrating the deficiency or excess of the nutrient elements in soil and optimizing fertilizers consumption in plants nutrition.