【摘要】 通过测坑控制试验,对比分析了苗期调亏条件下灌水定额对夏玉米的产量构成性状、耗水特性及WUE的影响。结果表明,在苗期适度亏水条件下,夏玉米的果穗长和穗行数几乎不受灌水定额的影响,其穗粒数和籽粒产量随灌水定额的增大呈波动上升变化,其中灌水定额105 mm处理的穗粒数和籽粒产量总是最大,而百粒质量则无明显的趋势性变化。夏玉米的总耗水量随灌溉定额的增大呈上升变化趋势,拔节期和抽雄期的日耗水强度较大,但易受当期气候条件影响。灌水定额75～105 mm可保证夏玉米获得较高的产量和WUE。综合当地生产实际及气象因素,苗期灌水定额60mm,拔节后灌水定额75mm时,可保证夏玉米节水高产。更多还原

【Abstract】 Through two-year lysimeter experiments,the variations of yield component traits,water consumption and water use efficiency of summer maize under different irrigation water quotas were analyzed.The results showed that ear length and row number per ear were not affected by irrigation water quota,but grain yields and grain number per ear increased with a rise in irrigation water quota.The grain yield and grain number per ear in the treatment with 105 mm of irrigation water quota were always the highest,and the water consumption of summer maize increased with irrigation water quota increasing.The daily water consumptions at jointing and tasseling stages were higher than those at other growing stages,which was greatly affected by the atmospheric conditions.It was proposed that selecting 75～105 mm as the irrigation water quota for summer corn should achieve higher grain yields and higher WUE.Based on these results,selecting the irrigation quota of 60 mm at seeding stage and 75 mm after jointing were thought to be optimal when the production practice and meteorological factors were comprehensively considered.更多还原