Soil nutrients variability and rational sampling quantity

Rational sampling of soil under certain condition was studied by using Geo statistics, GIS and Systematic Approach for Soil Nutrients Status Evaluation The results showed that most of soil nutrients possess semi variogram structure with longer range It is essential to consider the spatial variability of soil nutrients in order to balance sampling cost and accuracy GIS could give us better information about soil nutrient variability and supply the theoretical basis for arranging sampling site In this study, the rational sampling quantity could be determined by using Stratified and Rational Distributed Sampling The rational sampling quantity for available K in 34.5hm2 would be 24 under 95% significant level and 10% relative error and P would be 19 under 95% significant level and 20% relative error