[Effects of phosphate-dissolving fungi on transformation, fixation and efficiency of fertilizer 32P].
By using a radioactive 32P-labeled technique, this paper studied the effects of P-dissolving Penicillium oxalicum P8 inoculum on the transformation, fixation and efficiency of fertilizer P. The results showed that the inoculum could prevent available P from fixation by soil, and promoted the uptake of applied P by maize and peanut. Additionally, it reduced the amount of Ca10-P fraction derived from available P, increased the pool of available P, and maintained more 32P in forms of Ca2-P and Ca8-P. With time extending, the ratio of Ca10-P fraction in soil was gradually increased, and the treatment with P. oxalicum P8 showed the lowest ratio of Ca10-P form, compared with treatment without P. oxalicum P8. The inoculum not only prevented available 32P from turning into Ca10-P form, but also had a longer effective period.
Fan
Bingquan
B
Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China. Bqfan@caas.ac.cn
Jin
Jiyun
J
Ge
Cheng
C
D010367:Arachis / Q000254:growth & development; D018533:Biomass; D005308:Fertilizers; D010407:Penicillium / Q000254:growth & development / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D017553:Phosphorus Compounds / Q000378:metabolism; D010761:Phosphorus Radioisotopes; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D003313:Zea mays / Q000254:growth & development
D005308:Fertilizers; D017553:Phosphorus Compounds; D010761:Phosphorus Radioisotopes; D012987:Soil; D010758:Phosphorus