【摘要】 11年定位施肥试验的结果表明,不施肥与单施氮肥的处理,土壤速效磷迅速下降,前3年比播前降低约1倍,自第6年开始比播前降低2/3左右,降至4～5ppm以后处于稳定状态。有机肥及其与氮肥配合施用和氮磷钾肥配合施用能降低闭蓄态磷的含量,增加Ca-P、Fe-P、Al-P的含量,单施氮肥能增加闭蓄态磷的含量,Fe-P、Al-P含量略有增加,Ca-P的含量降低。施用无机肥比施用有机肥及配合氮肥的处理,增加无机磷含量4％～5.48％。施用有机肥及其与氮肥配合施用的处理比施无机肥的处理增加有机磷含量3.75％～5.41％。土壤有效磷与有机磷量、Al-P呈正相关,而与土壤全磷量、无机磷、Fe-P、Ca-P呈极显著正相关。有效磷与闭蓄态磷呈负相关。更多还原

【Abstract】 In this paper was reported a fertilizer experiment conducted at a fined location for eleven years. The results showed that the content of soil active phosphorus was decreased more rapidly in the treatment of applying no fertilizer than that of applying N.fertilizer only. The content of soil active phosphorous was decreased by one time in the first three years and about two thirds from the sixth year onwards, compared with that in the previous year. Finally, it was stabilized after being decreased to 4-5 ppm. In the treatment of applying manure or manure mixed with N fertilizer or N P K mixed with each other,the content of O-P was decreased ,but the content of Ca-P,Fe-P and Al-P was increased. In the treatment of applying N fertilizer only. the content of O-P was increased, the content of Fe-P, A1-P was increased a little , but the content of Ca-P was decreased , The content of soil inorganic phosphorous in the treatment of applying inorganic fertilizer was only 4%-5.48% higher than that in the treatment of applying manure only or manure mixed with Nitrogen. The content of soil organic phosphorous in the treatment of applying manure mixed with Nitrogen was 3.75%～5.41% higher than that in the treatment of applying inorganic fertilizer only. The content of soil available phosphorous was positively correlated with that of soil total phosphorous, inorganic phosphorous, Fe-P,Ca-P , organic phosphorous Al-P. and it was significantly correlated with the content of soil total phosphorous, inorganic phosphorous Fe-P, Ca-P. But the content of soil available phosphorous was negatively correlated with that of soil O-P.更多还原