华北农牧交错区覆膜沟作小南瓜的补灌效应

依据冀北高原2006年的集雨补灌试验,研究了不同生育期小南瓜补灌不同水量,对产量和耗水特征的影响。结果表明:开花期补水10.0 mm+果实膨大期补水15.0 mm处理的小南瓜经济产量比未补水对照增产28.0%。开花期一次补水15.0 mm处理比对照增产26.8%,两处理产量无明显差异;开花期补水15.0 mm处理的水分利用效率比对照提高16.2%。经济效益分析表明,开花期补水15.0 mm,补水纯收益最高可达57.4元/ m~3。本研究条件下,开花期补水的增产效果优于果实膨大期补水。通过集雨进行补灌,可以为半干旱区农田稳产提供一定的水分保障。

Effects of supplemental irrigation on pumpkin with film mulching and planting in furrow in the agro-pastoral ecotone of north China

According to the trial of harvesting rainwater and supplemental irrigation in north plateau of Hebei province in 2006,this paper studied the effects of different water by supplemental irrigat- ing at growing stages of pumpkin on yield and characters of water consumption.The results showed that supplemental irrigation at different growing stages can raise pumpkin yield to some extent.The yield of the treatment with supplementing water by 10.0 mm at blooming stage and by 15.0 mm at fruit expansion period together increased by 28.0% than that with no supplemental irrigation (CK).The yield and the water use efficiency of the treatment with supplementing water by 15.0 mm only at blooming stage was raised separately by 26.8% and 16.2% than CK.The economic analysis showed that the highest net income of supplemental irrigation was to 57.4 yuan/m~3 in the treatment with 10.0 mm supplemental water at blooming stage of pumpkin.The increase effect of supplemental irrigation at blooming stage was better than that at fruit expansion period in the exper- imental conditions.