STUDIES ON THE REGULARITY OF DRY MATTER ACCUMULATION AND DISTRIBUTION AND ITS INDEXES OF SPRING MAIZE OF 13 7-15 9 T/HA YIELD

The regularity of dry matter accumulation and distribution was studied with spring maize CV.Yedan No.13 and Zhundan No.2 and other four varieties under the condition of 13.7-15.9t/ha yield.The logistic equation of dry matter accumulation of individuality and group on different varieties was established.The maximal growing rate,average growing rate of dry matter accumulation of whole plant and the dynamic indexes of whole plant biological production was put forward on different varieties.We expounded the changing regularity of dry weight of stem,leaf and seed,and provided dynamic indexes of the growing rate of stem,leaf and seed dry matter on different varieties.The general character and differences of distribution and movement regularity of dry matter on different varietes were made clear.The movement ratio of assimilative matter and economic coefficient of CV.Yedan No.13 and other upright-leaf varieties are high,but CV.Zhundan No.2 is opposite.We also analyzed the dry matter source of seed and female tassel and the differences among different vareities.