灌水量对不同玉米杂交种生育后期干物质积累和产量的影响

Studies on the effect of water irrigation on the dry matter accumulation in the later growth stage and yield in different hybrid summer corn hybrids

在大田条件下研究了灌水量对不同玉米杂交种生育后期干物质积累和产量的影响 ,结果表明 ,灌水量对玉米生育后期干物质积累的自身规律影响不大 ,主要是改变了干物质的绝对积累量和收获指数 .但不同杂交种干物质积累对水分的响应存在着差异 ,豫玉 18号 (YY18)对水分的敏感性强于丹玉 13号 (DY13) .在节灌和足灌条件下 ,YY18的增产幅度远大于DY13的增产幅度 。

A study was carried out on the effect of water irrigation on the dry matter accumulation of different hybrid summer corns in the later growth stage under the field conditions. The result indicated that the rule of the corn dry matter accumulation was not significantly influenced by water irrigation,although the total amount of dry matter water accumulated in the whole growth stage and harvest indexes were different under various water conditions. However, the difference in the responses of dry matter accumulation to water between two hybrids were oberserved, YuYu 18(YY18) was more sensitive to water than DanYu 13(DY13). under both sufficient water irrigation and water-saving irrigation conditions, the range of increasing yield of YY18 is much higher than that of DY13. On the other hand, little difference between two hybrids existed under the drought condition.