Field experiments were carried out in 2007 and 2009 to investigate the effects of different sowing date and density, different spraying regulator date and concentration on wheat population quality, agronomic characteristics, stalk mechanical and the yields of semi-winter variety Yannong 19. In this study, four sowing data and densities (2007~2008), two spraying regulator data and concentrations (2008~2009) were designed, respectively. The results are as follows:
1. Effect of different sowing d...