ABSTRACT
Reclaimed land usually has some problems such as poor soil structure and nutrients shortage. The man-made improvement treatments could accelerate soil development of reclaimed soil and increase soil productivity. This study was conducted to the effectiveness of soil improvement with fly ash for reclaimed subsided land. A 0.23 ha of experimental site was chosen in Jiawang coal mining area, Jiangsu province. 6 treatments were designed with 3 types of materials such as 1% fly ash, 5% fly ash and poultry litter. The results showed that the application of fly ash could improve the reclaimed soil, but the amount of the fly ash should be more than 1%. The treatment of 1% fly ash had the lowest yield of soybean, even lower that of the reference plot. As fly ash has fewer nutrients, some organic fertilizers are needed for higher yield. The treatment with 5% fly ash with poultry litter got the highest yield of soybean. All the treatments of soil amendments had lower or equal to the concentrations of metal elements than that of control plot. The addition of organic fertilizer (D, E, F treatments) resulted significant decrease of the concentration of Zn and Cu in beans while the addition of 5% fly ash also had slight decrease of the concentration of Zn and Cu in beans. The pH and available nutrient contents of soils after harvest of the soybean were not affected by the application of fly ash.
This study supported by National Natural Science Foundation (40071045) and the bilateral project between Greece and P.R. China
