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在淹水培养条件下,进行了12种不同pH水稻土硅素累积释放试验,结合田间试验的效果,研究了土壤有效硅、水稻土硅的累积释放特征及其与硅肥肥效之间的关系。结果表明:1mol L-1HAc-NaAc(pH=4)缓冲液法不能直接判断碱性水稻土供硅能力。不同pH水稻土中硅素的释放过程可以用方程y=kxm来描述。土壤硅素120日累积释放量、硅素释放初始速率km与水稻相对产量具有显著的线性正相关关系。因此,应用土壤硅素释放动力学方程参数能够评价不同pH水稻土的供硅能力。
Under flooded culture conditions, the cumulative release of silicon in 12 different pH paddy soils was studied. According to the effect of field experiments, the cumulative release characteristics of silicon in soil available silicon and paddy soil and its relationship with the fertilizer efficiency were studied. The results showed that 1 mol L-1HAc-NaAc (pH = 4) buffer method could not directly determine the silicon supply ability of alkaline paddy soil. The release of silicon from different pH paddy soils can be described by the equation y = kxm. The cumulative 120 days of soil silicon release, initial release rate of silicon km and rice relative yield has a significant linear positive correlation. Therefore, applying the parameters of soil silicon release kinetic equation can evaluate the silicon supply ability of different pH paddy soils.