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对粉煤灰的理化性质和农业化学行为研究结果表明，粉煤灰颗粒以物理性砂粒为主体，主要物相为玻璃体（或无定形物质）。硅、铁、铝、磷、钙、镁的含量与土壤大致相同;锌、铜、钼、硼等微量元素高于土壤中的含量;重金属元素含量均未超过国家规定的控制标准，并以集合体的形态存在，活性低。粉煤炭有效硅（SiO2）含量在2.56～11.57g／kg之间，其硅的释放速度比土壤高2.0～11.0倍，施用量在75t／hm2以上能为水稻等禾本科作物提供相当数量的硅素。Elovich方程比较适合描述粉煤灰硅的释放过程，其b值能反映硅释放能力的大小。粉煤灰中磷的有效性低，对加入磷具有较强的吸附固定作用，并随粉煤灰含水量增加而显著增大。粉煤灰无论是作为土壤改良剂还是复合肥填充料，都必须考虑粉煤炭对磷的固定作用。
The results of physical and chemical properties and agrochemical behavior of fly ash show that the fly ash particles are mainly composed of physical sand grains and the main phase is vitreous body (or amorphous substance). The content of trace elements such as zinc, copper, molybdenum and boron was higher than that of soil. The content of heavy metal elements did not exceed the national control standard, Body shape exists, low activity. The effective silicon (SiO2) content of the pulverized coal is between 2.56 and 11.57 g / kg, and the silicon release rate is 2.0 to 11.0 times higher than that of the soil. The application rate above 75 t / hm2 can provide a considerable amount of silicon for gramineous crops such as rice . Elovich equation is more suitable to describe the release process of fly ash silicon, the b value can reflect the size of silicon release capacity. The availability of phosphorus in fly ash is low, which has a strong adsorption and fixation effect on phosphorus addition, and increases significantly with the increase of water content of fly ash. Fly ash, whether as a soil conditioner or compound filler, must take into account the fixed effect of coal on phosphorus.