Effects of Steel Slag, Fly Ash and Bottom Ash on the Growth of Rice Plant in Peat Soil
Abstract
Industrial activities in Indonesia generate waste such as steel slag, fly ash and bottom ash which contain macro, micro and beneficial nutrients. These industrial wastes are able to improve the quality of soil such as peat soil. However, these waste materials also contain toxic heavy metals that need to be assessed. This study aimed to evaluate the influence of steel slag, fly ash and bottom ash on the chemical properties of peat soil, the growth of rice plant (IR 64 variety), yield production and content of toxic heavy metals in rice. The ameliorant applied in each treatment were 0; 2,5; 5,0; 7,5 and 10,0% of the oven-dry soil weight. The incubation experiments showed that the addition of steel slag and fly ash was able to increase pH, available Ca, Mg and Si. Meanwhile bottom ash treatment only slightly improved the chemical properties of peat soil. In the green house experiment, the addition of steel slag, fly ash and bottom ash to peat soil was able to improve the growth of rice plant and yield production. The positive response of rice plants was related to increasing peat soil pH and availability of Si, Ca and Mg derived from the soil amendments. The rice did not contain Pb but contained Cd metals. Cd content in rice was within the maximum permissible limit for the heavy metal contaminants in the rice polished according to SNI 6128:2020.
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References
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Department of Soil Science and Land Resources Departemen Ilmu Tanah dan Sumberdaya Lahan, Faculty of Agriculture Fakultas Pertanian, IPB University