Ning Dongfeng, Liang Yongchao, Liu Zhandong, Xiao Junfu, Duan Aiwang
Ministry of Agriculture Key Laboratory of Crop Water Use and Regulation, Institute of Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, China.
Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China.
PLoS One. 2016 Dec 14;11(12):e0168163. doi: 10.1371/journal.pone.0168163. eCollection 2016.
Slag-based silicate fertilizer has been widely used to improve soil silicon- availability and crop productivity. A consecutive early rice-late rice rotation experiment was conducted to test the impacts of steel slag on soil pH, silicon availability, rice growth and metals-immobilization in paddy soil. Our results show that application of slag at a rate above higher or equal to 1 600 mg plant-available SiO2 per kg soil increased soil pH, dry weight of rice straw and grain, plant-available Si concentration and Si concentration in rice shoots compared with the control treatment. No significant accumulation of total cadmium (Cd) and lead (Pb) was noted in soil; rather, the exchangeable fraction of Cd significantly decreased. The cadmium concentrations in rice grains decreased significantly compared with the control treatment. In conclusion, application of steel slag reduced soil acidity, increased plant-availability of silicon, promoted rice growth and inhibited Cd transport to rice grain in the soil-plant system.
矿渣基硅酸盐肥料已被广泛用于提高土壤硅有效性和作物生产力。开展了一项早稻-晚稻连作试验，以测试钢渣对稻田土壤pH值、硅有效性、水稻生长及金属固定的影响。我们的结果表明，与对照处理相比，每千克土壤施用高于或等于1600毫克有效二氧化硅的钢渣，可提高土壤pH值、稻草和谷粒干重、植株有效硅浓度及水稻地上部硅浓度。土壤中未发现总镉（Cd）和铅（Pb）的显著积累；相反,镉的交换态部分显著下降。与对照处理相比，水稻籽粒中的镉浓度显著降低。总之，在土壤-植物系统中，施用钢渣可降低土壤酸度，提高硅的植物有效性，促进水稻生长，并抑制镉向水稻籽粒的转运。
