Development of soil moisture management models based on GIS for farmland and its application

Two simple thematic maps and two precise thematic maps for soil moisture and soil EC (electrical conductivity) were established separately based on GIS, hereby the models of sampling management and irrigation management were developed. Two interpolation models for two precise thematic maps were established with Kriging algorithm for soil moisture and universal Kriging algorithm for soil EC. The results showed that the RMSPE (Root Mean Square Percentage Error) of soil moisture prediction and soil EC was 5.489% and 18.451%, respectively. Finally, the sampling management models were developed based on the simple thematic maps, and the farming irrigation model based on the precise thematic maps was developed according to the expertise for the different farming target parameter during the different farming production period. Irrigation management using the model showed that soil moisture variance was adjusted from 1.9168 (before irrigation) to 0.8906 (after irrigation). Experiments show that the sampling management model is practical and the irrigation model can be used to guide farming production effectively.