施用高炉渣对土壤的pH和有效硅以及水稻植株含硅量的影响

采用盆栽试验的方法,研究了炼铁厂副产品3种高炉渣作硅肥使用对水稻土pH及土壤和水稻植株中硅素养分状况的影响。结果表明,在北方酸性水稻土上施用高炉渣可以提高土壤pH,增加土壤有效硅含量,促进水稻对硅素养分的吸收。上述效果随高炉渣用量的增加而更为明显,且高炉渣A和高炉渣F的效果要好于高炉渣B。

Effects of Applied Blast Furnace Slags on pH, Available Silicon in Soil and Silicon in Rice Plant

Pot experiments were conducted to study the effects of applying three kinds of blast furnace slag, a by-product from ironworks, as silicon fertilizer, on soil pH, content of available silicon in paddy soil, and silicon content in rice plant, with an acidic paddy soil in northern region of China. The results showed that the soil pH value and the content of available silicon in soil were increased evidently after it was receiving blast furnace slag, and their increasing trends were more and more obvious with increasing dosage of the blast furnace slag. By analyses of variance, for soil pH and the content of available silicon, the differences among different treatments with different dosages of blast furnace slag were significant (p=0.01). At the same time, more silicon nutrient was absorbed by rice, and contents of silicon in rice increased with increasing dosage of blast furnace slag. Moreover, there was a significantly positive logarithm correlation between contents of SiO2 in rice and dosages of blast furnace slag applied. So these all indicated that by applying these three blast furnace slag, silicon supplying capacity of paddy soil and silicon nutrition status of rice were improved steadily, and these effects of blast furnace slag A and blast furnace slag F were better than those of blast furnace slag B. There were also some problems, the measuring means about available silicon of soil receiving slag mucks and balanced fertilization including silicon, nitrogen, phosphorus, potassium and other nutrients, should be studied further.