灌水量与夏玉米光合性能及产量的关系

利用大型防雨设施池栽，研究灌水量与夏玉米光合性能及产量的关系。结果表明，灌水量与夏玉米光合性能及产量呈高度正相关，不同灌水量对群体光合速率、单叶光合速率、光合速率日变化、叶面积发展动态、干物质积累量及干物质生产率产生显著差异，并随生育进展而加剧。根据产量与耗水量的关系，夏玉米13 500 kg/hm²产量水平的耗水量在630 mm左右，9 000 kg/hm²产量水平的耗水量在490 mm左右，200 mm左右为夏玉米经济产量形成的耗水临界值。穗期、花粒期土壤水分状况不同是导致产量及光合性能差异增大的重要原因之一，保证夏玉米中、后期水分适宜是提高光合性能及产量的重要条件之一。

Effct of Irrigation Water Content on Photosynthetic Capacity and Yield of Summer Corn

Using large waterproof in stallations and pond cultivate,study the effect of irrigation water content on photosynthetic and yield of summer corn.The results showed:irrigation water content was signifi cant correlated with photosynthetic capacity and yield of summer corn.Different irrigation water content caused significantly difference on comopy photosynthetic rate,leaf photosynthetic rate,photosynthetic rate day changes,leaf area development dynamic,dry material accumnlated and dry material productive efficiency,and the difference increased with the growth,According to the relationship between yield and water consumption cotent,water consumption content of summer corn of 13 500 kg/hm² yield level and 9 000 kg/hm² yield level were 630 mm of so and 490 mm or so,respectively.Water consumption critical value of economic yield formation of summer corn is 200 mm or so.Leading to the difference of yield and photosynthetic capacity increase,soil water state of spike stage and anthesis and kernel stage was one of the significant reasons.To increase photosynthetic capacity and yield,assuring suitable water in middle stage and later stage of summer corn was one of the important conditions.