硅磷配施对水稻土中不同磷组分含量及有效性的影响

为探明硅磷互作与土壤中磷有效性的关系，盆栽试验条件下研究不同比例硅磷配施对水稻土中不同形态磷含量及其有效性的影响。试验中硅肥和磷肥分别设3个水平，共9个处理。结果表明，硅磷配施能够对水稻土中磷组分的含量产生不同影响。中磷水平下增施硅肥可提高磷肥的有效性，减少土壤中磷的固定，但在高磷高硅水平下，可能会降低土壤磷的有效性和土壤中有效磷含量，并抑制水稻植株对水稻土中有效磷的吸收，降低其他形态磷向有效态磷的转换。在该试验条件下，中硅水平的水稻产量随着磷肥水平的提高而增加，但高硅水平水稻干物质重和穗重却在高磷的水平下降低；与对照相比，中硅高磷水平下的水稻生长和产量提高幅度最大。

Effects of mixing fertilization of silicon and phosphorus on fractionation and availability of phosphorus in a paddy soil

The study investigated the effects of fertilization with different ratios of silicon and phosphorus fertilizers on the contents and bio|availability of different phosphorus fractions in a paddy soil through pot experiment. Three levels of silicon and phosphate fertilizer treatments were carried out， i.e.， a total of nine treatments. The purpose of the study is to improve the phosphorus use efficiency in a paddy soil. The results showed that silicon and phosphorus fertilizers could have different impacts on different phosphorus fractions in the paddy soil. Slight to moderate silicon fertilizer applying could improve the efficiency of phosphate fertilizer， reduce the fixation of phosphorus in soil. However， high silicon with high phosphorus level （SihPh） might inhibit the activity of available phosphorus， decrease soil available phosphorus content， decrease plant phosphorus absorption， and reduce the transformation of other phosphorus forms to available phosphorus. The treatment of SimPh gained the fastest growth and highest grain yield.