分根区垂向交替供水对玉米生长影响的研究

为探索1种新的节水灌溉技术——分根区垂向交替供水的节水增产效应，选用3种不同灌水方式(表面灌、下部灌、交替灌)和不同灌水周期(3 d、5 d、7 d)及不同灌水方式下的相同灌水量组合进行了盆栽玉米对比试验研究。结果表明，垂向交替供水是可行的，相同灌水量条件下交替供水对作物根系的生长有明显促进作用，使根系在土壤垂直剖面分布更为均匀。同时根系活力和吸收功能明显增强，整株作物长势呈现出苗壮根旺的特点。此外5 d的交替灌与3 d的表面灌相比，作物长势明显改善，且节水26%以上；7 d的交替灌与5 d的表面灌相比，作物长势无明显差异，但节水20%以上，而5 d的灌水周期是试验范围内交替灌应用时较为成功的方式。

Effect of alternative watering in vertical profile on corn growth

Under the condition of control test,by cultivation in pots containing soil,with corn as material, a new water-saving technology named the Control Root-splited Alternative Irrigation(CRAI) was studied. The treatments consisted of Surface Irrigation(SI),Low Irrigation(LI) and CRAI. The period of irrigation was 3 d,5 d,7 d.The watering amount is the same with the same irrigation method.The result showed that CRAI could stimulate root growth and make root distribution uniform in the vertical profile,and root activity was increased.Besides,corp growth of CRAI with 5 d was more improved better than that of SI with 3 d and water use efficiency was increased by 26%. Although no difference was found between the crop growth of CRAI with 7 d and that of SI with 5 d,WUE was improved by 20%.