He, Yan-fen; Ma, Chao-qun; Yang, Hai-juan - In: Asian Agricultural Research 1 (2009) 01
We use the mean value and variation coefficient model to analyze the spatial-temporal feature of grain production in 31 provinces from the year 1980 to 2006. Time series of grain production is divided into 3 stages according to the average yield and the variation coefficient of grain production...