为了探索一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 ,以盆栽玉米为试验材料 ,选用3种不同的灌水方式 (表面灌、下部灌、交替灌 )和不同的灌水周期 (3 d、5 d、7d)以及不同灌水方式下的相同灌水量组合进行了对比试验研究。结果表明 ,垂向交替供水是可行的。在相同的水势条件下 ,交替灌可提高作物的渗透调节能力 ,降低气孔关闭的临界水势 ,使光合同化产物从营养器官向生殖器官的分配增加 ,整株作物的长势呈现出苗壮、根旺的特点。此外 ,5 d的交替灌与 3 d的表面灌相比 ,不仅作物的长势明显改善 ,且节水 2 6 %以上 ;7d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 2 0 %以上。试验的最终结果认为 :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。当以土壤含水率控制时 ,拔节期下层土壤含水率应不低于 5 4%的田持 ,上层土壤含水率应不低于 40 %的田持 In order to explore a new water-saving irrigation technology - the water-saving and yield-increasing effect of vertical alternate water supply in the sub-root zone, potted maize was used as experimental material to select three different irrigation methods (surface irrigation, subsurface irrigation and alternate irrigation) Different irrigation cycles (3 d, 5 d, 7d) and different irrigation methods under the same amount of irrigation experiments conducted a comparative study. The results show that vertical alternate water supply is feasible. Under the same water potential conditions, alternate irrigation can improve the ability of osmotic adjustment of crops, reduce the critical water potential of stomatal closure, and increase the distribution of photosynthetic products from vegetative organs to reproductive organs. The growth of whole plants shows strong growth and root vigor specialty. In addition, compared with the surface irrigation at 3 days, the alternate irrigation at 5 days not only significantly improved the crop growth but also saved more than 26% water. Compared with the surface irrigation at 5 days, there was no significant difference in crop growth between the alternate irrigation at 7 days and the surface irrigation at 5 days. But more than 20% water saving. The final result of the experiment is that the 5-day irrigation cycle is a more successful method of alternating irrigation within the experimental range. When controlled by soil moisture content, the soil moisture content of the lower jointing stage should not be lower than 54%, the upper soil moisture content should not be lower than 40%