EM用于污水灌溉对小白菜产量和土壤肥力的影响

合理的灌溉指标和方法，是污水灌溉安全高效进行的主要保证。在污水灌溉中引入EM技术，以小白菜为研究对象、盆栽试验为手段，研究了在奶牛场废水灌溉条件下，不同灌水下限条件对作物生长和土壤的影响。结果表明，奶牛场废水灌溉不会导致小白菜减产，而且能够增加土壤的速效氮和速效磷，在污水中添加EM进行灌溉，对土壤养分增加的效果更为明显。试验结果还显示70％和80％W间持水量的灌溉下限对污水灌溉较为适宜。但长期灌溉奶牛场废水是否会发生氮、磷的淋溶，污染地下水，还需进一步的研究。

Effect of EM Application in Wastewater Irrigation on Yield of Cabbage and Soil Fertility

Diary effluent is typically rich in nitrogen and phosphorus, and wastewater irrigation can reduce fertilizing costs and slacken contamination. However, poor irrigation scheduling may lead to stressed crops and reduced crop growth, over irrigation can make nitrate-nitrogen and phosphorus leaching to the groundwater. To guarantee wastewater irrigation proceeding efficiently and safely, pot experiment of dairy effluent irrigation was conducted, in which three kinds of water including clean water(CW), dairy effluent(OWW) and dairy effluent added EM(EM) and four irrigation lower limit including 60%,70%,80% and 90% of field capacity were set. The experiment lasted one and a half month. The results revealed that dairy effluent irrigation did not result in the yield reduction of Chinese cabbage, but could increase soil available nitrogen and available phosphorus, especially in the treatment EM. In the treatment of CW, soil available phosphorus decreased as irrigation lower limit rose at harvest, but the soil fertility increased in the treatment EM and CWW. It is most efficient for dairy effluent irrigation with 70% or 80% of field capacity as lower thresholds of soil moisture. But the impact of dairy effluent irrigation on leaching of nitrogen and phosphor, and pollution of groundwater in long term should be investigated.