Abstract
Soils polluted with heavy metals have become common across the plantation sector. There is a reduction in plant growth as well as the yield of the plants that have been planted on heavy metal-contaminated soil. Uses of fertilizers and other soil amendments also add small amounts of heavy metals to the soil, which can develop over time with repeated applications. This study was conducted to identify the appropriate rate of paddy husk biochar applied to soil in order to reduce the presence of heavy metals. The main focus was to determine the availability of heavy metals in soil such as zinc. Next, is to know the best possible measure of biochar towards the contaminated soil to decrease the metal availability. The treatment of this experiment is different rates of biochar which are 0 g, 15 g, 20 g, 30 g and 40 g. This research measured the available Zn in the soil before and after applying PHB, which takes 3 weeks to let them interact. The biochar significantly influenced the Zn availability in soil. This study has shown that the application of PHB to soil has the potential to reduce the availability of Zn.
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