ACTA AGRICULTURAE BOREALI-SINICA ›› 2010, Vol. 25 ›› Issue (3): 200-204. doi: 10.7668/hbnxb.2010.03.042

Special Issue: Soil fertilizer

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The Changes of Microbial Biomass P in Two Calcareous Soils with Low Available P Following Cooperating Four Crop Straws

ZHAO Xiao-rong1, ZHOU Ran2, 1, LI Gui-tong1   

  1. 1. College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China;
    2. Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China
  • Received:2010-01-08 Published:2010-06-28

Abstract: Soil microbial biomass is of high variance depending on soil conditions.In this study, two calcareous soils with low available P were amended with wheat,maize, soybean and cotton crop straws,and then incubated at 25℃ for 90 days.The aim was to investigate the effects of straw amendment on soil microbial biomass P( Bp) and the ratio of microbial biomass C to P.The results showed that,under the condition of supplying enough N, two soils had similar microbial biomass C and not significantly affected by adding crop straws.However, soil microbial biomass P was different in the soils and significantly influenced by adding straws.Soil microbial biomass P increased with soil available P and P concentration in crop straws.In contrast, the ratio of microbial biomass C to P decreased.Phosphorus concentration of microbial biomass in the soil containing low available P was mainly affected by the P content in crop straws.But, in the soil with relatively high available P, phosphorus concentration of microbial biomass was not significantly affected by the P content in crop straws.

Key words: Crop straws, Microbial biomass P, Microbial biomass C-to-P ratio, Soil available P

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Cite this article

ZHAO Xiao-rong, ZHOU Ran,, LI Gui-tong, LIN Qi-mei. The Changes of Microbial Biomass P in Two Calcareous Soils with Low Available P Following Cooperating Four Crop Straws[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2010, 25(3): 200-204. doi: 10.7668/hbnxb.2010.03.042.

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