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Genetic Improvement of Grain Yield and Associated Traits in the Northern China Winter Wheat Region from 1960 to 2000

^a Crop Science Institute/National Wheat Improvement Center, Chinese Academy of Agricultural Sciences (CAAS), No 12 Zhongguancun South St., Beijing 100081, China
^b CIMMYT China Office, C/O CAAS, No 12 Zhongguancun South St., Beijing 100081, China
^c Crop Research Institute, Shandong Academy of Agric. Sciences, No 28 Sangyuan Rd., Jinan 250100, Shandong, China
^d College of Agronomy, Northwest Sci-Tech Univ. of Agric. and Forestry, Yangling 712100, Shaanxi, China

View larger version (26K): [in this window] [in a new window]   Fig. 1. Regression of grain yield on year of release in the four trials. (a) YPT1 in Beijing, (b) YPT2 in Hebei, (c) YPT3 in Shandong, and (d) YPT4 in Henan. * and ** represent significance at the 0.05 and 0.01 probability levels, respectively.