华北地区苜蓿再生水灌溉研究

Study on Reclaimed Wastewater Irrigation for Alfalfa in North China

根据苜蓿再生水灌溉试验资料,对清水灌溉、混合水灌溉和再生水灌溉三种灌溉方式下苜蓿土壤中的氮素土壤剖面分布规律和作物指标进行了研究,其硝态氮、碱解氮、有效磷土壤剖面分布规律基本一致,其规律为：其氮素含量在0~40cm深度内随着深度的增加而有较大幅度的减少,40cm以下变化则较小;混合水灌溉和再生水灌溉的硝态氮、碱解氮、有效磷含量均高于清水灌溉。苜蓿侧枝增加数、株高增长速率和地上部干物重均为再生水处理最高。

According to the data of reclaimed wastewater irrigation for alfalfa, the profile distributions of soil nitrogen and the growth of alfalfa under three irrigation treatments, including proper irrigation with fresh water, proper irrigation with proportion of fresh and reclaimed water, proper irrigation with reclaimed water, is analyzed. The results indicate that the profile distributions of nitrate nitrogen, alkali-hydrolysable nitrogen, and available phosphorus are the same. The law is that soil nitrogen is substantially decreased with the increase of depth in the depth of 0 to 40 cm soil layer, no significant difference can be found on 40 to 180 cm soil layer; the nitrate nitrogen, alkali-hydrolysable nitrogen, and available phosphorus under the condition of proper irrigation with proportion of fresh and reclaimed water or proper irrigation with reclaimed Water is higher than that under proper irrigation with fresh water. The stem length, lateral branch number, and plant biomass are significantly increased under proper irrigation with reclaimed water.