Engineering Technology Research Center;
Geographic Information Development and Application of Hebei;
Institute of Geographical Sciences;
Hebei Academy of Sciences;
Shijiazhuang 050011;
China;
Center for Agricultural Resources Research;
Institute of Genetics and Developmental Biology;
Chinese Academy of Sciences;
Shijiazhuang 050021;
China;
anthesis date; maturity date; sowing date; growth period; cultivar shift;