The experiment was conducted at the experimental farm of Shandong Agricultural University during 2001 and 2002. In the first year, six varieties were selected and their changes of yield and difference of quality were compared in field high temperature conditions. On the basis of that, Nongda108 (which represents the type of better adaptation to high temperature) and Shangnong3 (which represents the type of poor adaptation to high temperature) were selected in that basis. Effect of high temperatu...