The spatial variation of soil nutrients in topsoil (0-20 m) was analyzed using semivariogram in the Zunhua County of Hebei Province, China. The effect on semiva
The paper discusses mainly about the modelling process and related problems with examples from Chinese and French cases. Five practical problems must be solved
The application of atrazine in China during the last ten years has led to some environmental problems. In this paper, the multimedia model of atrazine in soil-p