[Dynamics of microbial biomass N in different fertilized black soil and its related factors].
This paper studied the dynamics of microbial biomass N in a black soil long-term fertilized with farmyard manure (M2 and M4) and chemical fertilizer (NPK) during crop growth season. The results showed that the soil microbial biomass N was 25.52-239.12 mg x kg(-1) in M4, 10.40-94.31 mg x kg(-1) in M2, 6.27-87.04 mg x kg(-1) in NPK, and 9.15-69.81 mg x kg(-1) in CK. In same treatment, the highest value was 7-14 times higher than the lowest value. Treatments NPK and M2 had the highest value of microbial biomass N at reproductive growth stage, while M4 and CK had it at vegetative growth stage. The significant difference of soil microbial biomass N caused by different treatments was not changed with plant growth stages. The dynamics of soil microbial biomass N had a significant correlation some soil biological, physical and chemical properties. A significant positive correlation was found between soil microbial biomass N and soil biological, physical and chemical properties, plant N, P and K contents, soil moisture, and grain crude protein.
Li
Dongpo
D
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110116, China. li dp 1964@sohu.Com
Chen
Lijun
L
Wu
Zhijie
Z
Zhu
Ping
P
Ren
Jun
J
Liang
Chenghua
C
Peng
Chang
C
Gao
Hongjun
H
D002681:China; D018556:Crops, Agricultural / Q000254:growth & development; D017753:Ecosystem; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D013997:Time Factors
D005308:Fertilizers; D012987:Soil; D009584:Nitrogen