Research on Precision Irrigation in Western Semiarid Area of Heilongjiang Province by Interpreting Data Source Spatial Distribution

Geostatistics and geographic information system (GIS) were performed to characterize the spatial variability of soil water characteristics in western semiarid area of Heilongjiang Province and delineate the spatial distributions of the variables. On the basis of data source spatial distribution and professional knowledge, the study site was divided into four irrigation management zones. Then stratified sampling method and optimal distribution method were used to calculate the rational sampling number in each sub-zone and rational sampling scheme was designed combing with the ranges of regionalized variables. During the course of practicing precision irrigation, irrigation scheme can be designed by measuring natural water content in each sub-zone and comparing with saturated water content, field water capacity and wilting point in the same area.