磷素营养和水分胁迫对春小麦产量及水分利用效率的影响

The Effects of Phosphorus Nutrition and Water Stress on Yield and Water Use Effeciency of Spring Wheat

研究了土壤干旱下Ｐ素营养对春小麦生长发育、产量和水分利用效率的影响。结果表明，Ｐ素和水分对春小麦的生长发育皆有直接影响，且存在交互作用。干旱条件下，施Ｐ能促进春小麦的生长发育，提高产量和水分利用效率，但与不施Ｐ相比，受旱后所受抑制程度更大，对干旱的敏感性也更强。因此，严重干旱下，施Ｐ虽显著增产。

The effect of phosphrous nutrition on the growth and development, yield and water use efficiency of spring wheat were studied under soil drought conditions.The results showed that phosphrous nutrition and soil drought were of direct effect on growth and development and yield of spring wheat. Because phosphrous nutrition directly met the biomass production requirment of spring wheat for nutrition element,yield and water use efficiency were markedly raised, but they were more sensitive to soil drought in comparsion with lower phosphrous treatment. Yield was obviously higher than that of lower phosphrous under seriouse drought condition,but increase was markedly lower than that under normal water supply condition.