Bhattacharya S S, Chattopadhyay G N
Institute of Agriculture, Visva-Bharati, Sriniketan 731236, West Bengal, India.
J Environ Qual. 2002 Nov-Dec;31(6):2116-9. doi: 10.2134/jeq2002.2116.
Due to the environmental problems created by large-scale fly ash generation throughout the world, efforts are being made to recycle these materials. An important component of the recycling effort is using fly ash to improve low-fertility soils. Because availability of many nutrients is very low in fly ash, available ranges of such nutrients must be improved to increase the effectiveness of fly ash as a soil amendment. In the present study, we assessed the possibility of increasing P bioavailability in fly ash through vermicomposting in a yard experiment. Fly ash was mixed with organic matter in the form of cow (Bos taurus) dung at 1:3, 1:1, and 3:1 ratios and incubated with and without epigeic earthworm (Eisenia fetida) for 50 d. The concentration of phosphate-solubilizing bacteria (PSB) was found to increase many fold in the earthworm-treated series of fly ash and organic matter combinations compared with the series without earthworm. This helped to transform considerable amounts of insoluble P from fly ash into more soluble forms and thus resulted in increased bioavailability of the nutrients in the vermicomposted series. Among different combinations of fly ash and organic matter, P availability in fly ash due to vermicomposting was significantly higher in the 1:1 fly ash to cow dung treatment compared with the other treatments.
由于全球大规模产生粉煤灰所带来的环境问题，人们正在努力对这些材料进行回收利用。回收利用工作的一个重要组成部分是利用粉煤灰改良低肥力土壤。由于粉煤灰中许多养分的有效性很低，必须提高这些养分的有效范围，以提高粉煤灰作为土壤改良剂的效果。在本研究中，我们通过庭院试验评估了通过蚯蚓堆肥提高粉煤灰中磷生物有效性的可能性。将粉煤灰与牛粪形式的有机物按1:3、1:1和3:1的比例混合，并在有和没有表栖蚯蚓（赤子爱胜蚓）的情况下孵育50天。与没有蚯蚓的系列相比，在蚯蚓处理的粉煤灰和有机物组合系列中，发现解磷细菌（PSB）的浓度增加了许多倍。这有助于将粉煤灰中大量不溶性磷转化为更易溶的形式，从而导致蚯蚓堆肥系列中养分的生物有效性增加。在粉煤灰和有机物的不同组合中，与其他处理相比，1:1粉煤灰与牛粪处理中由于蚯蚓堆肥导致的粉煤灰中磷的有效性显著更高。
