摘要
依据田间灌溉试验资料,研究了不同供水条件下夏玉米的耗水规律及对其生长发育和水分利用效率的影响。结果表明:轻度、中度、重度亏水处理的夏玉米,全生育期耗水量分别比对照减少了11.9%、15.4%、24.4%;对照日耗水量在拔节?抽雄期最大,而亏水处理在抽雄?灌浆期最大。当苗期和拔节期土壤相对含水率大于55%时,对夏玉米的生长发育及干物质的形成影响不大,且复水后产生了明显的补偿效应,最终在增产或减产幅度不大的情况下提高了水分利用效率。而当土壤相对含水率小于50%时,对其生长发育和干物质的形成造成不良影响,复水后补偿效应也不明显,产量和水分利用效率都有所下降。
Based on the field irrigation experiment data, the water-consuming ruse of summer maize, the effects of water stress on growth, development and water use efficiency under different water treatment are studied in this paper. The results show that the water consumption quantity during the whole growth of summer maize under light water deficit, medial water deficit and severe water 90 deficit is decreased by 11.9%, 15.4%, 24.4%. respectively, as compared with conventional irrigation. The highest daily water consumption is in the stage of node elongation to tasseling for the conventional irrigation treatment, while it is in the stage of tasseling to grain filing for the water deficit treatment. When the soil moisture in the stage of seeding and booting is more than 55% of the field water capacity, the effects of water deficit on growth, development and dry matter accumulation are not great, the compensation effect is obvious after re-watering, and the water use efficiency is enhanced under the condition of yield increase or decrease not too much in the end. But when the soil water moisture was less than 50%, the growth, blight is exerted on the development and dry matter accumulation of summer maize, the compensation effects is not obvious after re-watering, the yield and water use efficiency all decrease.
出处
《节水灌溉》
北大核心
2008年第11期18-21,共4页
Water Saving Irrigation
基金
国家高技术研究发展计划("863"计划)项目(作物水分亏缺补偿技术)。
关键词
夏玉米
耗水规律
水分胁迫
水分利用率
summer maize
water-consuming law
water stress
water use efficiency
