猪粪和磷肥对石灰性土壤有机磷组分及有效性的影响

通过室温培养—盆栽试验研究了施用猪粪和磷肥(磷酸二氢钾)后石灰性土壤有机磷组分的变化及不同有机磷组分对黑麦草吸磷总量的贡献。结果表明，施用猪粪和磷肥显著地增加了活性、中活性和中稳性有机磷的含量，其中以中活性有机磷增量最大；活性和中活性有机磷对黑麦草吸磷总量直接贡献较大。活性、中活性和中稳性有机磷对黑麦草吸磷总量也有一定的间接贡献。按它们总的贡献可排序为活性有机磷＞中活性有机磷＞中稳性有机磷。

EFFECTS OF PIG SLURRY AND PHOSPHATIC FERTILIZER ON ORGANIC-P FRACTIONS AND THEIR AVAILABILITIES

Incubation and pot experiments were conducted to study changes in organic-P fractions in calcareous soils after application of pig slurry and monopotassium phosphate (MPP) and their contributions to Puptake by rye grass.The results indicated that: (1) Liable, moderately liable and moderately stable organic-P of soils increased markedly after the application of pig slurry and MPP, with the middle one being mostly increased; (2) The liable and moderately liable organic-P made greater direct contribution to the total amount of P uptake by rye grass and all the three organic-P fractions had some indirect contribution; (3) Based on their comprehensive effects on the amount of P uptake by rye grass, the three organic-P fractions ranked in such order: liable organic-P > moderately liable organic-P > moderately stable organic-P.