[Dynamics of soil P pool in a long-term fertilizing experiment of wheat-maize rotation. I. Crop yield effect of fertilizer P and dynamics of soil total P and inorganic P].
The effects of long-term applying fertilizer P and manure on the pools of soil total P and inorganic P and the crop yield in rotation of winter wheat-summer maize-->spring maize were studied. The results showed that the pool of soil total P and inorganic P were increased by applying fertilizer P and manure, and the phosphorus mostly accumulated in soil was inorganic P. The critical amounts of fertilizer P (P2O5) for balancing soil P were 94.7 kg.hm-2 to winter wheat-summer maize and 51.5 kg.hm-2 to spring maize. Based on regression equations, the application rates of fertilizer P (P2O5) for economic optimum and highest yields were 135.8 and 149.8 kg.hm-2 to winter wheat-summer maize, and 88.6 and 95.9 kg.hm-2 to spring maize, respectively.
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