Effects of N, P and K fertilization on wheat yield and fertilizer use efficiency in Weibei rainfed hihgland Characteristics of dry matter and potassium accumulation and distribution in potato plant in semi-arid rainfed areas. Effect of mulching method on soil temperature and grain yield of spring wheat in rainfed agricultural areas of northwestern China Application of AMMI Model in the stability analysis of spring wheat in rainfed areas Application of GGE biplot in spring wheat yield stability analysis in rainfed areas of China