Chemical attributes of soil irrigated with treated sewage effluent and cultivated with bell pepper

Abstract The use of treated sewage effluents (TSE) for irrigation purposes is a viable alternative for wastewater reuse and nutrient supply to the soil, which represent the two main environmental benefits. This work therefore evaluated the effect of the application of TSE on the quantity of nutrients added to the soil and changes in the chemical attributes of a Red-Yellow Latosol in the layer from 0.0 to 0.2 m cultivated with the bell pepper F1 Canary hybrid and surface drip irrigated. The experiment was carried out under field conditions from September 2015 to January 2016 in a randomized block statistical design with four replications, including the following treatments: river water, TSE, river water with base fertilization, TSE with base fertilization, TSE with cover fertilization, and TSE with cover and base fertilization. Irrigation of the bell pepper cultivation with TSE increased the level of potassium but did not affect the levels of phosphorus, organic matter and pH of the soil at the end of the growing cycle. The following amounts of nutrients were added to the soil by irrigation with TSE: 10 kg ha-1 of total nitrogen, 10 kg ha-1 of total potassium and 0.5 kg ha-1 of total phosphate. In general, TSE induced greater productivity of the peppers than those irrigated with river water, even when including mineral fertilization.摘要：经处理的污水出水（Treated Sewage Effluents, TSE）用于农业灌溉是废水回用与土壤养分补给的可行途径，二者为该方案的两大核心环境效益。本研究针对种植‘加那利’F1杂交甜椒、采用地表滴灌方式的田块，评估了施加TSE对土壤输入养分总量及0.0~0.2m土层红黄色砖红壤化学属性变化的影响。 试验于2015年9月至2016年1月在田间条件下开展，采用随机区组设计并设置4次重复，共设置6组处理：河水灌溉组、TSE灌溉组、河水配施基肥组、TSE配施基肥组、TSE配施追肥组，以及TSE配施基肥与追肥组。 生育周期结束后测定结果表明：采用TSE灌溉可提升土壤钾素含量，但对土壤磷素、有机质含量及pH值无显著影响；通过TSE灌溉为土壤输入的养分量分别为：全氮10 kg·hm⁻²、全钾10 kg·hm⁻²及全磷0.5 kg·hm⁻²。 总体而言，即便配施矿质肥料，TSE灌溉组的甜椒产量仍显著高于河水灌溉组。