Effect of Matter Production and Yield Formation on Sowing Date and Density in Maize

ZD958 was used as the experimental material,the effects of matter production and yield formation on sowing date and density in maize were studied.The results showed that sowing date and density had a tightness relationship with group dry matter accumulation in maize,and early sowing with thick planting,late sowing with thin planting were beneficial to group dry matter accumulation.Yield was decreased with sowing date delayed,and the later the sowing,the significant the yield decreased.The difference of contribution rate for yield on yield composition was due to meteorological condition.Ear number and thousand kernel weight had a greater contribution rate on yield,and both reduced with sowing date delayed.Adequate light radiation before anthesis,timely rainfall in anthesis,suitable effective accumulated temperature after anthesis had an obvious auxo-action on maize yield.Light radiation had an extreme effect on ear numbers after emergence 50-60 days.Light radiation and rainfall had a positive correlation with kernels per ear during this period,and effective accumulated temperature had a significant effect on a thousand kernel weight between days after emergence 70 days and maturity.Therefore,taking full advantage of climatic resources,fair adjustment of sowing dates,making the critical period of maize growth and development in optimal meteorological condition,were beneficial to develop high yield potential of maize.