论文部分内容阅读
研究认为,磷肥施入土壤后,土壤有效磷增量随施磷量增加而增加,又随施磷后时间的延长而减少,有效磷增量与时间的关系可用△P=a·e~(-bt)的函数式描述。施磷后水溶性磷逐渐向Ca—P体系和Al·Fe—P体系两个方面转化,以增加Ca—P为主。磷肥肥效试验表明,给豆科作物,特别是豆科绿肥施磷,冬小麦利用后效、增产和肥地效果都很好,可起到“以磷增氮”、以无机换有机的双重效果。
The results showed that the increment of soil available P increased with the increase of P application, but also decreased with the increase of P application time. The relationship between available phosphorus increment and time could be expressed as: △ P = a · e ~ -bt) functional description. After phosphorus application, the water-soluble phosphorous gradually transformed into Ca-P system and Al · Fe-P system, mainly increasing Ca-P. Phosphate fertilizer efficiency test showed that the leguminous crops, especially leguminous green manure phosphorus, winter wheat use after effect, yield and fertilizer are very good, can play a “phosphorus by nitrogen,” the dual effect of inorganic to organic.