不同改良措施对铁尾矿pH值及速效养分含量的影响

目的]探讨不同改良措施对铁尾矿砂的影响。方法]利用盆栽正交试验设计研究土壤、有机肥、矸石、粉煤灰、保水剂5种不同改良措施对尾矿基质pH值和速效养分含量的影响。结果]尾矿砂∶土壤=2∶2,施用有机肥75g/kg,不添加矸石,添加粉煤灰的量占总重量的4%,添加保水剂1.25g/kg改良pH值的效果最好,pH值为7.42。施用有机肥对增加尾矿基质速效养分的影响最大,其次是添加土壤,其他3个因素提高对尾矿基质养分有一定的促进作用。结论]用土壤或有机肥改良尾矿砂的方法值得大力推广。

Effects of Different Improving Measures on the pH Value and Available Nutrients of Iron Tailings

Objective] The study aimed to discuss the effects of different improving measures on iron tailing sand. Method] The effects of 5 different improving measures such as soil, organic fertilizer, gangue, fly coal ashes and water-retaining agent on the pH value and available nutrients of iron tailings medium were studied by potted orthogonal test design. Result] The effect of iron tailings and soil at 2∶2, organic fertilizer at 75 g/kg, no gangue, fly coal ashes at 4 % of total weight and water-retaining agent at 1.25 g/kg on pH value was best and its pH value was 7.42. Organic fertilizer application had the most effect on increasing available nutrients in iron tailings medium, the soil addition was next and the other three factors had some improvement effect on increasing nutrients in iron tailings medium.Conclusion] The method of using soil or organic fertilizer to improve iron tailings sand was worth of popularizing.