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Vegetative approach for improving the quality of water produced from soils in the westside of central California

机译：改善加利福尼亚中部西部土壤产生的水质的植物性方法

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Water reuse is a proposed strategy for utilizing or disposing of poor quality drainage water produced in the westside of central California. This 2-year field study evaluated the ability of two potential forage species to tolerate irrigation with water high in salinity, boron (B), and selenium (Se). The species used were: Sporobulus airoides var. salado (alkali sacaton) and Medicago sativa var. salado (alfalfa). After first year establishment with good quality water (<1 dS m−1), the two species were furrow-irrigated with drainage effluent that had an average composition of sulfate-dominated salinity ((electrical conductivity (EC) of 6.2 dS m−1)) B (5 mg l−1), and Se (0.245 mg l−1). Both crops were clipped monthly from June to October of each year. Total dry matter yields averaged between 11 and 12 mg ha−1 for both crops irrigated with effluent for two growing seasons. Plant concentrations of Se ranged from a low of 1.3 mg kg−1 in alkali sacaton to a high of 2.5 mg kg−1 in alfalfa, while B concentrations ranged from a low of 60 mg kg−1 in alkali sacaton to a high of 170 mg kg−1 in alfalfa. Chemical composition of the soil changed as follows from preplant to post-irrigation after two seasons with drainage effluent: EC from 2.78 to 6.5 dS m−1, extractable B from 1.9 to 5.6 mg l−1, and no change in extractable Se at 0.012 mg l−1 between 0 and 45 cm. Between 45 and 90 cm, EC values increased from 4.95 to 6.79 dS m−1, extractable B from 2.5 to 4.8 mg l−1, and no change in extractable Se at 0.016 mg l−1. Increased salinity and extractable B levels in the soil indicate that management of soil salinity and B will be necessary over time to sustain long term reuse with poor quality water.
机译：中水回用是一项提议的策略，用于利用或处置在加利福尼亚中部西部生产的劣质排水。这项为期2年的田间研究评估了两种潜在草料品种对高盐度水，硼（B）和硒（Se）的耐受灌溉能力。使用的物种是：Sporobulus airoides var。 Salado（碱盐味萨卡顿）和Medicago sativa var。萨拉多（苜蓿）。在第一年用优质水（<1 dS m-1 ）建立后，对这两个物种进行沟灌，其排水成分中硫酸盐盐分的平均组成为（（电导率（EC））6.2 dS m-1 ））B（5 mg l-1 ）和Se（0.245 mg l-1 ）。每年的六月至十月，每月都会对这两种农作物进行减产。在两个生长季节中，使用污水灌溉的两种作物的平均干物质总产量平均在11至12 mg ha-1 之间。硒的植物浓度范围从碱度囊中的低1.3 mg kg-1 到苜蓿中的最高2.5 mg kg-1 ，而硼的浓度低至60 mg kg-1碱贮藏物中的到苜蓿中高达170 mg kg-1 。土壤的化学成分从种植前到灌溉后经过两个季节的排水后变化如下：EC从2.78到6.5 dS m-1 ，可提取的B从1.9到5.6 mg l-1 ，并且在0和45 cm之间的0.012 mg l-1 下可萃取硒没有变化。在45至90 cm之间，EC值从4.95 dS m-1 增加到6.79 dS m-1 ，可萃取的B从2.5升高到4.8 mg l-1 ，而可萃取的Se在0.016 mg l-1 <不变。 / sup>。土壤中盐度和可萃取B含量的增加表明，随着时间的流逝，必须对土壤盐分和B进行管理，以维持劣质水的长期再利用。

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