【摘要】 为探寻夏玉米适宜的限额灌溉控制指标,通过灌水下限(适宜水分CK1;轻旱LD;中旱MD;重旱CK2)与灌水定额(30、45、60、75、90 mm)两因素组合,研究调亏模式下限额灌溉对夏玉米耗水特性及产量的影响。结果表明,产量与耗水量呈显著的二次函数关系;同一灌水定额下,轻旱处理的总耗水量总体较大;LD60和LD75两处理获得了较好的穗部性状表现和较高的籽粒产量,且年际间变异不大;LD60和LD90两处理的WUE值较高,但存在一定的年际间差异,主要与其耗水量变化有关。总之,夏玉米低定额补灌定额不宜小于60 mm,拔节后遭受轻度水分胁迫时灌水60 mm可满足需求,遭受中度以上干旱时可适当增加灌水量,更有利于夏玉米抗旱稳产。更多还原

【Abstract】 In order to explore the appropriate quota irrigation control index for summer maize,through the combination of low irrigation limits(suitable water CK1;light drought LD;Medium drought MD;Severe drought CK2) and irrigation quotas(30,45,60,75,90 mm),the effects of quota irrigation on water consumption characteristics and yield of summer maize under regulated deficit mode were studied. The results showed that there was a significant quadratic function relationship between yield and water consumption. Under the same irrigation quota,the total water consumption of light drought treatment was larger in general. The LD60 and LD75 treatments had better panicle characters and higher grain yield,with little inter-annual variation. The WUE values of LD60 and LD90 treatments were higher,but there was a certain inter-annual difference,which was mainly related to the change of water consumption. In conclusion,the low-quota supplementary irrigation quota of summer maize should not be less than 60 mm. After jointing,60 mm irrigation can meet the demand when subjected to mild water stress,and the irrigation amount can be appropriately increased when subjected to moderate or above drought,which is more conducive to drought resistance and stable yield of summer maize.更多还原