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以玉米为试验材料,利用盆栽试验研究了苗期调亏灌溉对玉米植株性状、光合生理及产量的影响。结果表明,玉米苗期轻度、中度、重度调亏处理株高、茎粗、单株叶面积、单株冠风干重和单株根风干重均低于对照;但根冠比、根长高于对照。在子粒灌浆期测量光合速率,苗期轻度、中度调亏光合速率高于对照,苗期重度调亏光合速率低于对照,但叶片水分利用效率均高于对照。苗期中度调亏增产1.90%,苗期轻度、重度调亏分别减产1.47%和6.58%。苗期土壤持水量在田间持水量的50%以上时,起到蹲苗促根生长的作用,对产量影响差异不显著,可以考虑不灌。
Taking maize as test material, pot experiment was conducted to study the effects of regulated deficit irrigation on plant characters, photosynthetic physiology and yield of maize at seedling stage. The results showed that plant height, stem diameter, leaf area per plant, air dry weight per plant and air dry weight per plant were lower in maize seedlings under mild, moderate and severe deficit treatments. However, the ratio of root to shoot, root length Higher than the control. The photosynthetic rate was measured at grain filling stage, and the photosynthetic rate at seedling stage was moderate and moderate, the photosynthetic rate at severe seedling stage was lower than that of the control, but the water use efficiency of leaves was higher than that of the control. Moderate adjustment deficit increase 1.90% in seedling stage, seedling mild, severe deficit reduction respectively 1.47% and 6.58%. Seedling soil water content in the field more than 50% of water, played the role of promoting growth of squat seedling root, the yield was no significant difference, you can consider not irrigation.