In order to know the biological effect of singer and cooperative applications of PP333 and CC on maize, and provide its theoretical basis for the chemical regulation and the application of PP333 and CC. On the basis of a series of concentrations in advance, this scheme designed four treatments of seed soaking contrastive experiments: ①H2O (CK); ② 50mg ·L-1 PP333 ③ 300 mg · L-1CC ; ④ 50mg · L-1 PP333 + 300mg · L-1 CC. The research findings were presented briefly as follows:(l)The single and cooperative appli...