This paper described the use of fly ash for soil amelioration of acidic soils to promote plant growth. In mining sites, acid sulfate soils/rocks, which contain sulfide minerals (e.g. pyrite FeS₂), have appeared as a result of overburden excavation. The excessively acidic condition inhibits plant growth due to the dissolution of harmful elements, such as Al, Fe, and Mn. Fly ash, an alkaline byproduct of coal combustion generated in thermal power plants is expected to be adopted to ameliorate acidic soils. However, the mixing ratio of fly ash must be considered because excessive addition of fly ash can have a negative impact on plant growth due to its physical/chemical properties. The pot trials using Acacia mangium demonstrate the evolution of plant growth with a 5%–10% addition of fly ash into acidic soil. When the acidic soil has a high potential for metal dissolution, the metal ions leached from the acidic soil are large, making it difficult to improve plant growth due to osmotic and ionic stress. This work suggests that the effects of fly ash on metal ions leached from the soil have to be considered for the amelioration of acidic soil.

本文描述了使用粉煤灰对酸性土壤进行土壤改良以促进植物生长。在矿区，由于覆盖层开挖，出现了含有硫化矿物（例如黄铁矿 FeS _{2 ）的酸性硫酸盐土壤/岩石。}过度的酸性条件由于有害元素的溶解而抑制了植物的生长，例如铝、铁和锰。粉煤灰是火电厂燃煤产生的碱性副产品，有望用于改善酸性土壤。但是，必须考虑飞灰的混合比例，因为飞灰的过量添加会因其物理/化学性质而对植物生长产生负面影响。使用金合欢的盆栽试验展示了向酸性土壤中添加 5%–10% 的飞灰时植物生长的演变。当酸性土壤金属溶解潜力大时，从酸性土壤中浸出的金属离子较大，由于渗透和离子胁迫，难以改善植物生长。这项工作表明，为了改善酸性土壤，必须考虑飞灰对从土壤中浸出的金属离子的影响。