Pedosphere 7(3): 225--230, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Changes of soil microbial biomass C and P during wheat growth after application of fertilizers
SHEN Qi-Rong, WANG Yan, CHEN Wei and SHI Rui-He
Nanjing Agricultural University, Nanjing 210095 (China)
      A pot experiment was carried out with a clay loam in a green house. The results showed that soil microbial biomass C increased with the application of organic manure at the beginning of the experiment and then gradually decreased with declining of the temperature. The soil biomass C increased at the tillering stage when the temperature gradually increased, and rose to the highest value at the anthesis stage, being about 554.9~794.4 mg C kg-1. The application of organic manure resulted in the highest increase in biomass C among the fertilization treatments while that of ammonium sulphate gave the lowest. At the harvest time the soil biomass C decreased to the presowing level. Like the soil biomass C the amount of biomass P was increased by the incorporation of organic manure and was the highest among the treatments, with the values of the check and ammonium sulphate treatments being the lowest. Meanwhile, the changing patterns of the C/P ratio of soil microbial biomass at stages of wheat growth are also described.
Key Words:  C/P ratio, soil microbial biomass C and P, winter wheat
Citation: Shen, Q. R., Wang, Y., Chen, W. and Shi, R. H. 1997. Changes of soil microbial biomass C and P during wheat growth after application of fertilizers. Pedosphere. 7(3): 225-230.
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