By expanding the surface area and/or by other chemical reactions, soil additives such as biochar help retain nutrients in the soil. n this work, the effects of biochar on the adsorption and desorption of heavy metals and soil elements necessary for plant growth were investigated. To illustrate the adsorption of nutrients and heavy metals from solution on biochar, the Freundlich isotherm was employed. The rise in mineral nutrients, pH, and EC was linked to an increase in CEC with warmth. Because of its high CEC, biochar improves soil health and increases plant nutrient availability, which can boost agricultural yield when applied to the soil. In manure + biochar at 2.5 + 7.5 t/ha application rate the NH4+-N adsorption capacity was minimum in T7 (15.9 and 117.66) followed by T4 (17.6 and 130.24), T13 (18.7 and 138.38) and maximum in T10 (20.1 and 148.74) at 25 and 200 mg kg-1 level of added NH4+-N, respectively than control T1 (10.3 and 75.3). An increase in the rate of biochar application led to a favourable effect by increasing the NO3–N adsorption capability. The effect on P adsorption was more with biochar than manures. In manure + biochar at 2.5 + 7.5 t/ha application rate the Pb adsorption capacity was minimum in T7 (4.46 and 30.77) followed by T10 (4.71 and 32.49), T13 (5.16 and 35.60) and maximum in T4 (5.48 and 37.81) at 10 and 100 mg kg-1 level of added Pb, respectively than control T1 (1.86 and 12.83). Goat manure, FYM, vermicompost, and poultry manure had the greatest effects on desorption. The desorption of all heavy metals Cd, Pb, Zn, and As decreased as the rate of biochar application increased. Based on excess nutrients and heavy metals, this study supports the use of biochar to mitigate environmental concerns.

中文翻译：

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生物质来源的生物炭对不同金属吸附和解吸能力的影响

通过扩大表面积和/或通过其他化学反应，生物炭等土壤添加剂有助于保留土壤中的养分。在这项工作中，研究了生物炭对植物生长必需的重金属和土壤元素的吸附和解吸的影响。为了说明生物炭上溶液中营养物质和重金属的吸附，采用了 Freundlich 等温线。矿物营养素、pH 值和 EC 的上升与 CEC 随温度升高的增加有关。由于其高 CEC，生物炭可以改善土壤健康并增加植物养分的利用率，施用于土壤后可以提高农业产量。在粪肥 + 生物炭中，施用量为 2.5 + 7.5 吨/公顷时，NH4+-N 吸附能力在 T7 中最小（15.9 和 117.66），其次是 T4（17.6 和 130.24）、T13（18.7 和 138.38），在 T10 中最大（20.1 和 138.38）。 148.74）在添加 NH4+-N 水平为 25 和 200 mg kg-1 时分别高于对照 T1（10.3 和 75.3）。生物炭应用率的增加通过增加NO3-N吸附能力产生了良好的效果。生物炭对磷吸附的影响比粪肥更大。在粪肥 + 生物炭中，施用量为 2.5 + 7.5 吨/公顷时，Pb 吸附能力在 T7 中最小（4.46 和 30.77），其次是 T10（4.71 和 32.49）、T13（5.16 和 35.60），在 T4 中最大（5.48 和 37.81）。添加 Pb 的水平为 10 和 100 mg kg-1 时，分别比对照 T1（1.86 和 12.83）。山羊粪、FYM、蚯蚓粪和家禽粪对解吸的影响最大。随着生物炭施用量的增加，所有重金属Cd、Pb、Zn和As的解吸量均下降。基于过量的营养物质和重金属，这项研究支持使用生物炭来减轻环境问题。