The effect of organic amendments on phytoavailability of nickel (Ni) and other metals in soil may change with time due to transformation of organic matter. We investigated the residual effect of organic amendments (farm manure [FM], poultry manure [PM], pressmud [PrM], and activated carbon [AC]) to immobilize Ni and other metals in soil and absorption of metals by Egyptian clover. Fresh and dry weights of Egyptian clover increased significantly (p < 0.05) due to residual effect of amendments compared to control. Extractable Ni and other metals had significant positive correlation with residual organic matter in soil. Extractable manganese (Mn) in post-harvest soil of Egyptian clover increased compared with that of post-harvest soil of maize (previous crop). However, extractable copper (Cu) decreased with amendments. Copper was the maximum in control followed by AC. Zinc in soil decreased in FM and PrM treated pots but increased in pots amended with PM and AC. Concentration of Ni, Mn, and Cu was the minimum in shoots of those plants grown with AC amended pots compared to the control. It was concluded that AC was the most effective for immobilization of metals in soil which consequently decreased the concentration of metals in shoots of Egyptian clover.

中文翻译：

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活性炭和其他有机改性剂对受污染土壤中埃及三叶草（Trifolium alexandrinum）的固定化和植物有效性镍及其他金属的残留效应的比较。

由于有机物的转化，有机改性剂对土壤中镍（Ni）和其他金属的植物利用率的影响可能会随时间变化。我们研究了有机改良剂（农场肥料[FM]，家禽粪便[PM]，Pressmud [PrM]和活性炭[AC]）对土壤中镍和其他金属的固定化以及埃及三叶草对金属的吸收的残留效应。与对照相比，由于修正的残留效应，埃及三叶草的鲜重和干重显着增加（p <0.05）。镍和其他可萃取金属与土壤中残留有机物呈显着正相关。埃及三叶草的收获后土壤中的可提取锰（Mn）比玉米（过往作物）的收获后土壤中的高。但是，可提取的铜（Cu）随着修正而减少。铜是对照中最大的，其次是AC。FM和PrM处理的盆栽土壤中的锌含量降低，而PM和AC改良的盆栽土壤中的锌含量升高。与对照相比，使用AC改良盆栽的那些植物的芽中，Ni，Mn和Cu的浓度最低。结论是，AC最有效地将金属固定在土壤中，从而降低了埃及三叶草芽中金属的浓度。