[Dynamics of soil P pool in a long-term fertilizing experiment of wheat-maize rotation. II. Dynamics of soil Olsen-P and inorganic P].
Studies on the dynamics of soil Olsen-P and different form inorganic P in the long-term fertilizing experiment of winter wheat-summer maize-->spring maize rotation showed that the contents of Olsen-P and inorganic P were changed by the accumulation and consumption of P in soil. In P0 treatments, Olsen-P decreased gradually, and then, trended to the critical level. When fertilizing amount was basically equal to the intake by crops, the balance of Olsen-P was dynamically maintained. The contents of Olsen-P and inorganic P were enhanced, when applied P was larger than the P intake by crops. The major contents of residual inorganic P were Ca2-P and Ca8-P, both accounting for 52.3% of total inorganic P in average, and Ca8-P accounting for 78.3%. Al-P and Fe-P accounted for 26.1%, and O-P and Ca10-P accounted for 20.4% of total inorganic P. The availability of fertilizer P was obviously increased by long-term applying fertilizer P together with manure, compared with applying fertilizer P alone.
Liu
J
J
China Agricultural University, Beijing 100094. Jianling@bd-user.he.cninfo.net
Zhang
F
F
D002681:China; D018556:Crops, Agricultural / Q000254:growth & development; D017753:Ecosystem; D005308:Fertilizers; D010758:Phosphorus / Q000378:metabolism; D017553:Phosphorus Compounds / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D013997:Time Factors; D014908:Triticum / Q000254:growth & development*; D003313:Zea mays / Q000254:growth & development*
D005308:Fertilizers; D017553:Phosphorus Compounds; D012987:Soil; D010758:Phosphorus