拔节水对春玉米光合性能及产量形成的影响

STUDIES ON THE EFFECT OF WATER AT JOINTING STAGE ON PHOTOSYNTHETIC FUNCTION AND YIELD FORMATION OF SPRING MAIZE

通过田间试验 ,明确了丰水的 1998年拔节水对春玉米光合性能及产量形成有以下影响 :平均叶面积指数和最大叶面积指数分别提高 4%和 12 % ,总光合势增长 6 % ;全期干物质最快累积速度 479kg/ hm2 · d,提高 12 % ,生物产量提高 13% ;籽粒平均增长速度 2 .84g/株· d,增产 14.5 % ,单株籽粒重 15 6 g,增长 12 .4% ;在籽粒的干物质来源中 ,开花后合成累积部分占 46 .5 % ,提高 9.6个百分点 ;干物质在叶、茎、苞叶等器官的移动率 。

Through the field experiments,the effect of water at jointing stage on photosynthetic function and yield formation of spring maize was made clear in 1998.The average LAI and the maximum LAI is respectively increased by 4 and 12 per cent.The total photosynthesis potential is increased by 6 per cent.The fastest rate of dry matter accumulation during the whole growth and development stage is 479kg/ha per day and it is increased by 12 per cent.The biological yield is increased by 13 per cent.The average growth rate of seed is 2.84 g/d one plant and it is increased by 14.5 per cent.The weight of kernels one plant is 156 gram and it is increased by 12.4 per cent.Among the sources of dry matter in seeds,the accumulation quantity of dry matter after blooming is 46.5 per cent and it is increased by 9.6 per cent.The translocation rate of dry matter of leaf and stem and other organs is decreased,and harvest indexes are decreased,too.