Salinity prompts heavy metals accumulation and adversely affects nutrient contents in soil and plants, thereby reducing crop yields. The assessment of domestic sewage sludge (SS) under saline conditions to boost crop productivity has become crucial. A field trial was conducted for two consecutive years (2017–2019) with three irrigation levels [canal water (0.35 dS m−1), I1; 8 dS m−1, I2; and 10 dS m−1 saline water, I3]; and five fertilization levels [control, F1; SS (5 t ha−1), F2; SS (5 t ha−1) + 50% RDF, F3; SS (5 t ha−1) + 75% RDF, F4; and RDF, F5]. The results revealed that treatment I3 (10 dS m−1) reduced the grain yield of pearl millet and wheat by an average of 31.2 and 32.6%, respectively, compared to I1 (0.35 dS m−1). However, among fertilizer treatments, F5 obtained significant highest grain and straw yields statistically at par with F4 treatment. Also, in the context of nutrients content in crops, a similar trend has been reported. In the addition, with the usage of saline irrigation (EC 8 and 10 dS m−1) and SS (5 t ha−1), the availability of heavy metals in crops and soil had increased (p = 0.05). The soluble ions in soil increased with increasing salinity levels of irrigation water. The extractability series of heavy metals were: Pb > Co > Ni > Cr > Cd. The addition of SS, however, recorded a higher concentration of DTPA-extractable metals in soil over control. The heavy metals content did not exceed toxicity levels in soil and plants. Hence, the incorporation of SS (5 t ha−1) resulted in saving 25% mineral fertilizers and, also combined use of SS with mineral fertilizers proved to be economically beneficial for crop production.

中文翻译：

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污水污泥对盐分环境下珍珠粟-小麦系统产量、养分和重金属含量的影响

盐分会促进重金属的积累，并对土壤和植物中的养分含量产生不利影响，从而降低作物产量。在盐分条件下评估生活污水污泥 (SS) 以提高作物生产力已变得至关重要。连续两年（2017-2019 年）进行了田间试验，采用三个灌溉水平 [运河水 (0.35 dS m-1), I1; 8 dS m−1, I2; 和 10 dS m−1 盐水，I3]；和五个施肥水平[控制，F1; SS (5 t ha−1), F2; SS (5 t ha−1) + 50% RDF，F3；SS (5 t ha−1) + 75% RDF，F4；和 RDF，F5]。结果表明，与 I1 (0.35 dS m-1) 相比，处理 I3 (10 dS m-1) 使珍珠粟和小麦的籽粒产量平均分别降低了 31.2% 和 32.6%。然而，在施肥处理中，F5 获得了显着最高的谷物和秸秆产量，统计上与 F4 处理相当。此外，在作物营养成分的背景下，也有类似的趋势。此外，随着盐渍灌溉（EC 8 和 10 dS m-1）和 SS（5 t ha-1）的使用，作物和土壤中重金属的可用性增加（p = 0.05）。土壤中的可溶性离子随着灌溉水盐度的增加而增加。重金属的可萃取性系列为：Pb > Co > Ni > Cr > Cd。然而，添加 SS 后，土壤中 DTPA 可提取金属的浓度高于对照。重金属含量没有超过土壤和植物中的毒性水平。因此，加入 SS（5 t ha−1）可节省 25% 的矿物肥料，并且，