水稻土中硅磷元素的存在形态及其相互影响研究

Study on Interaction and Forms of Silicon and Phosphate in Paddy Soil

采用室内培养试验研究不同施硅和施磷处理对水稻土中硅、磷不同存在形态的影响。结果表明 ,硅磷具有相互促进肥效的关系。施硅影响土壤无机磷的形态 ,硅的施用增加了土壤中Ca2 -P、Al-P和O -P的含量 ,Ca8-P、Ca10 -P变化不明显 ,Fe -P的含量显著降低。其中原因可能是Fe -P在水稻土中活性较高。硅酸钠与硅酸钙相比 ,前者的作用更为明显。施磷影响土壤硅的不同形态 ,磷的施用增加了土壤中水溶性硅和活性硅的含量 ,降低了无定形硅的含量 ,这可能与磷的存在改变了土壤

Effect of supplying silicon and phosphate of different forms was studied with cultural experiment in paddy soil. The results show: silicon and phosphate can improve the fertilizer efficiency of each other. Forms of inorganic phosphorus is affected by application of silicon. After applying silicon to the paddy soil,the contents of Ca 2-P and Al-P and O-P are increased,while content of Ca 8-P and Ca 10 -P are hardly affected and Fe-P content is reduced obviously. The most possible reason is that the activity of Fe-P is high in paddy soil. Compared with CaSiO 3,the effect of Na 2SiO 3 is more obvious on the forms of phosphorus. Forms of silicon are affected by supplying phosphorus. The content of water-soluble silica and active silica are enhanced after applicating phosphorus, but the amorphous silica content is reduced. The possible reasoncould be that application of phosphorus changes the soil pH value.