Irrigation with recycled domestic wastewater has been known to obtain positive effects on improving soil fertility, but it may also become a risk factor in case of causing an increase in soil salinity and/or heavy metal concentration of soil. No-tillage can retain soil moisture, helping to reduce irrigation water necessity, and thus lower amounts of heavy metals and salts are added to soil under wastewater irrigation conditions. The objective of this study was to analyze the effects of wastewater irrigation at different levels of on silage maize cultivation under conventional tillage and no-tillage conditions by comparing to full irrigation with fresh water. The two-year experiment was planned according to the split-plots design in the random blocks with three replications. The results indicated that full irrigation with wastewater increased soil salinity, organic matter content, total nitrogen, plant available phosphous, exchangeable cations, exchangeable sodium percentage and soil essential and non-essential heavy metal contents, but decreased soil pH and lime content. Increasing rates in organic matter content, total nitrogen, plant available phosphorus and exchangeable potassium were higher, but in electrical conductivity, and heavy metal accumulation were lower in soil under no-tillage as compared to conventional tillage. Contamination and enrichment factors and geographic accumulation index showed that non-essential heavy metal contamination due to cadmium and nickel, increased in full irrigation with wastewater. Irrigation with wastewater also increased heavy metal accumulation in silage maize. No-tillage can be a recommendable water management practice considering that the risks of soil salinity and heavy metal accumulation can be reduced and that soil fertility can be increased. Also, in reducing the risk of accumulation of cadmium and nickel in soil, 33% deficit irrigation with wastewater can make no-tillage more available.

众所周知，利用回收的生活废水进行灌溉对提高土壤肥力具有积极作用，但如果导致土壤盐分和/或土壤重金属浓度增加，它也可能成为一个风险因素。免耕可以保留土壤水分，有助于减少灌溉用水的需求，从而在废水灌溉条件下减少土壤中添加的重金属和盐的量。本研究的目的是通过与淡水充分灌溉进行比较，分析常规耕作和免耕条件下不同水平废水灌溉对青贮玉米种植的影响。为期两年的实验是根据随机区组中的裂区设计进行的，并进行了三次重复。结果表明，废水充分灌溉提高了土壤盐分、有机质含量、全氮、植物有效磷、交换性阳离子、交换性钠百分比以及土壤必需和非必需重金属含量，但降低了土壤pH和石灰含量。与常规耕作相比，免耕土壤的有机质含量、全氮、植物有效磷和交换性钾的增长率较高，但电导率和重金属积累较低。污染富集因子和地理累积指数表明，废水充分灌溉下镉、镍等非必需重金属污染有所增加。用废水灌溉还增加了青贮玉米中重金属的积累。考虑到可以降低土壤盐分和重金属积累的风险并提高土壤肥力，免耕可以成为一种值得推荐的水管理方法。此外，为了降低土壤中镉和镍积累的风险，使用废水进行 33% 的赤字灌溉可以使免耕技术更加可行。