不同灌水定额对冬小麦耗水规律及产量的影响

对比分析了不同灌水定额下冬小麦生长、产量及耗水特性。结果表明,冬小麦拔节至抽穗阶段,灌水定额较小时对株高增长不利。播种—拔节期和灌浆—成熟期阶段耗水量较大,但日耗水量较小;拔节—抽穗期和抽穗—灌浆期阶段耗水量较小,但日耗水量较大;不同灌水定额对穗粒数和穗长的影响较小,灌水定额越大,千粒质量和产量越高,但亩穗数和水分利用效率越低。综合考虑,灌水定额以900m3/hm2为宜。

Effects of Different Irrigation Quotas on Water Consumption and Yield of Winter Wheat

The effects of irrigation quota on the growth,water consumption and yield of winter wheat were analyzed.Results showed that:in jointing and heading stages,smaller irrigation quota was not good for the quick growth of plant height;Water consumption was larger in seeding-jointing and grouting-maturation stages with smaller daily water consumption while water consumption was smaller in jointing-heading and heading-grouting stages with higher daily water consumption;There was little effect on length and numbers of grain under different irrigation quotas.The larger irrigation quota was,the larger thousandkernel weight and yield were,but the smaller grain numbers and water use efficiency were.The irrigation quota of 900m3/hm2 is recommended to save water and improve the yield.