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Impacts on soil quality from long-term irrigation with treated greywater

机译:经处理的灰水长期灌溉对土壤质量的影响

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摘要

Drought condition in many places leads to the imperative use of greywater for irrigation. There is a serious concern on the impact of such prolonged uses on soil sustainability. The objective of this study was to evaluate the long-term impacts of greywater irrigation on soil electrical conductivity (EC) and other soil quality parameters in field conditions. Six locations were monitored in this study where home gardens have been irrigated with treated greywater for 2 years. Results showed a general reduction in EC levels of soil samples along all depth intervals at all locations. The average soil EC before greywater irrigation was 0.97 dS/m and decreased to 0.41 dS/m, which may be due to the use of greywater as well as the rainwater effect. The reduction in soil EC and irrigation water quantity shows positive correlation (correlation coefficient r = 0.64). Calcium precipitation might also have a major role in soil EC reduction. Soil calcium content was 81 mg L-1 before using treated greywater and decreased to 43 mg L-1 after 2 years of treated greywater usage, which might have been caused by calcium carbonates (CaCO3) precipitation. The results of other soil chemical analyses clearly show that using treated greywater for irrigation has reduced the concentration of organic matters, K, Cd, Pb, P, Mg, Cl, Na, exchangeable sodium percentage, and sodium adsorption ratio after 2 years of application. Zn concentration increased from 11 to 15 mg L-1, and soil pH became slightly higher from 7.6 to 7.8.
机译:许多地方的干旱状况导致必须使用中水进行灌溉。这种长时间使用对土壤可持续性的影响引起严重关注。这项研究的目的是评估田间条件下灰水灌溉对土壤电导率(EC)和其他土壤质量参数的长期影响。在这项研究中,监测了六个位置,其中家庭花园已用经过处理的灰水灌溉了2年。结果表明,在所有位置的所有深度间隔内,土壤样品的EC含量普遍下降。灰水灌溉前的平均土壤EC为0.97 dS / m,降至0.41 dS / m,这可能是由于使用了灰水以及雨水效应所致。土壤EC和灌溉水量减少呈正相关(相关系数r = 0.64)。钙的沉淀也可能在减少土壤EC中起主要作用。在使用处理过的灰水之前,土壤钙含量为81 mg L-1,而在使用处理过的灰水使用2年后,土壤钙含量降至43 mg L-1,这可能是由碳酸钙(CaCO3)沉淀引起的。其他土壤化学分析的结果清楚地表明,使用灰水进行灌溉后,施用2年后降低了有机物,钾,镉,铅,铅,镁,氯,钠,可交换钠的百分比和钠吸附率的浓度。 。锌浓度从11 mg L-1增加到15 mg L-1,土壤pH从7.6升高到7.8。

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