The application of ameliorant has been suggested to improve soil fertility and crop growth in post illegal gold mining (PIGM) lands. This study evaluated the effect of ameliorant types and semi-permeable layer on properties of soil in PIGM lands and growth of sorghum. A field experiment employed two treatments, i.e. type of ameliorant and semi-permeable layer. There were four ameliorant types applied i.e., without ameliorant (M0); coastal sediment at a dose of 40 t/ha (M1); biochar at a dose of 4 t/ha (M2), and coastal sediment at a dose of 30 t/ha + 4 t biochar/ha(M3). The second treatment consisted of two levels, namely: without a semi-permeable layer (S0) and the semi-permeable layer of 20 cm depth from the soil surface (S1). The results showed that types of ameliorant gave different effect to soil properties. Application of coastal sediment at a dose of 40 t/ha significantly increased the contents of Ca and Mg, whereas application of biochar at a doses of 4 t/ha increased soil CEC. The semi-permeable layer did not significantly affect plant height and stem diameter of sorghum. The highest of sorghum growth was reached by application of coastal sediment at a dose of 30 t/h + biochar at a dose of 4 t/ha. The combination of coastal sediment and biochar from banana peels could complement each other to improve soil fertility in PIGM land
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机译：已建议使用改良剂来改善非法采金后（PIGM）土地上的土壤肥力和作物生长。这项研究评估了改良剂类型和半透层对PIGM土地土壤特性和高粱生长的影响。现场实验采用了两种处理方法，即改良剂和半渗透层的类型。共有四种类型的改良剂，即不使用改良剂（M0）；沿海沉积物，剂量为40吨/公顷（M1）；生物炭的剂量为4吨/公顷（M2），沿海沉积物的剂量为30吨/公顷+ 4吨生物炭/公顷（M3）。第二种处理包括两个层次，即：没有半透水层（S0）和距土壤表面20厘米深度的半透水层（S1）。结果表明，不同类型的改良剂对土壤性质的影响不同。以40吨/公顷的剂量施用沿海沉积物显着增加了钙和镁的含量，而以4吨/公顷的剂量施用生物炭则增加了土壤CEC。半透层不会显着影响高粱的株高和茎直径。高粱的最高生长量是通过以30 t / h的剂量施用沿海沉积物+以4 t / ha的剂量施用生物炭达到的。沿海沉积物和香蕉皮生物炭的组合可以相互补充，从而改善PIGM土地的土壤肥力
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