Environ Sci Pollut Res Int. 2014 Jan;21(1):774-80. doi: 10.1007/s11356-013-2138-3.
In this study, improvement of acidic soil with respect to soil pH and exchangeable cations was attempted for sample with an initial pH of approximately 5. Acidic soil was amended with various waste resources in the range of 1 to 5 wt.% including waste oyster shells (WOS), calcined oyster shells (COS), Class C fly ash (FA), and cement kiln dust (CKD) to improve soil pH and exchangeable cations. Upon treatment, the soil pH was monitored for periods up to 3 months. The exchangeable cations were measured after 1 month of curing. After a curing period of 1 month, a maize growth experiment was conducted with selected-treated samples to evaluate the effectiveness of treatment. The treatment results indicate that in order to increase the soil pH to a value of 7, 1 wt.% of WOS, 3 wt.% of FA, and 1 wt.% of CKD are required. In the case of COS, 1 wt.% was more than enough to increase the soil pH value to 7 because of COS's strong alkalinity. Moreover, the soil pH increases after a curing period of 7 days and remains virtually unchanged thereafter up to 1 month of curing. Upon treatment, the summation of cations (Ca, Mg, K, and Na) significantly increased. The growth of maize is superior in the treated samples rather than the untreated one, indicating that the amelioration of acidic soil is beneficial to plant growth, since soil pH was improved and nutrients were replenished.
本研究旨在改善初始 pH 值约为 5 的酸性土壤的土壤 pH 值和可交换阳离子。将各种废资源（包括废牡蛎壳（WOS）、煅烧牡蛎壳（COS）、C 级粉煤灰（FA）和水泥窑灰（CKD））以 1 至 5wt%的比例添加到酸性土壤中，以提高土壤 pH 值和可交换阳离子。处理后，监测土壤 pH 值长达 3 个月。在 1 个月的固化期后测量可交换阳离子。在 1 个月的固化期后，用选定的处理样本进行玉米生长实验，以评估处理的效果。处理结果表明，为了将土壤 pH 值提高到 7，需要添加 1wt%的 WOS、3wt%的 FA 和 1wt%的 CKD。对于 COS，只需添加 1wt%就足以将土壤 pH 值提高到 7，因为 COS 具有很强的碱性。此外，在固化期为 7 天之后，土壤 pH 值增加，此后直至 1 个月的固化期基本保持不变。处理后，阳离子（Ca、Mg、K 和 Na）的总和显著增加。处理样本中的玉米生长情况优于未处理样本，表明酸性土壤的改良有利于植物生长，因为土壤 pH 值得到了改善，养分得到了补充。
