脱硫石膏改良碱化土壤种植水稻施用量研究

选择具有典型代表性的宁夏西大滩碱化土壤,采用拉丁方田间试验设计进行脱硫石膏改良碱化土壤种植水稻(Oryza sativa)的施用量研究.试验研究表明施用脱硫石膏能够降低土壤碱化度、总碱度和pH值,提高水稻的出苗率和产量.但是,脱硫石膏施用量不同,土壤碱化度、总碱度和pH值降低的值不同.根据脱硫石膏施用量与土壤碱化度、总碱度、pH值降低的模拟曲线关系,当脱硫石膏施用量为2.8～3.1kg·m~(-2)时,土壤碱化度、总碱度、pH值降低的值达到最大.同时,根据脱硫石膏施用量与水稻出苗率和产量的模拟曲线关系,当脱硫石膏施用量为2.86kg·m~(-2),水稻出苗率达到最大,为84.7%;当脱硫石膏施用量为2.79kg·m~(-2)时,水稻产量达到最大,为0.75kg·m~(-2).因此,建议脱硫石膏改良碱化土壤种植水稻的施用量为2.8～3.1kg·m~(-2).

Research on the amount of desulfurized gypsum from the coal-burning power plant applied to improve the alkalized soil for paddy rice

A latin square field test was designed for the research on the amount of desulfurized gypsum applied to improve the alkalized soil for paddy rice. The research result has shown that the application of desulfurized gypsum can distinctly decrease the ESP(exchangeable sodium percentages), total alkalinity and pH value of the soil. A different amount of desulfurized gypsum applied will decrease the ESP, total alkalinity and pH value of the soil to different levels. The analog curve for the correlations between the amount of desulfurized gypsum applied and the decreases of ESP, total alkalinity and pH of the soil has shown that the decreases of ESP, total alkalinity and pH of the soil are the maximum, when 2.8-3.1 kg·m~(-2) of desulfurized gypsum are applied. Desulfurized gypsum applied can distinctly improve the seedling rate and yield of paddy rice. The analog curve for the correlations between the amount of desulfurized gypsum applied and the seedling rate and yield of paddy rice has shown that the seedling rate and yield of paddy rice are the maximum of 84.7% and 0.75kg·m~(-2) when 2.86kg·m~(-2) and 2.79kg·m~(-2) of desulfurized gypsum are respectively applied. The amount of desulfurized gypsum applied to improve the alkalized soil for paddy rice is 2.8-3.1kg·m~(-2).