RICE SCIENCE

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Combined Effects of Nutrient and Pesticide Management on Soil Microbial Activity in Hybrid Rice Double Annual Cropping System

XIE Xiao-mei1, LIAO Min1, LIU Wei-ping2, Susanne KLOSE3   

  1. 1Natural Resources Science Department, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310029, China; 2Environmental Science Department, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310029, China; 3Institute of Soil Science, Faculty of Forest, Geo and Hydro Sciences, Dresden University of Technology, Tharandt D-01735, Germany
  • Received:2003-01-14 Revised:1900-01-01 Online:2004-03-30 Published:2004-03-30

Abstract:

Combined effects on soil microbial activity of nutrient and pesticide management in hybrid rice double annual cropping system were studied. Results of field experiment demonstrated significant changes in soil microbial biomass phospholipid contents, abundance of heterotrophic bacteria and proteolytic bacteria, electron transport system (ETS)/dehydrogenase activity, soil protein contents under different management practices and at various growth stages. Marked depletions in the soil microbial biomass phospholipid contents were found with the advancement of crop growth stages, while the incorporation of fertilizers and/or pesticides also induced slight changes, and the lowest microbial biomass phospholipid content was found with pesticides application alone. A decline in the bacterial abundance of heterotrophic bacteria and proteolytic bacteria was observed during the continuance of crop growth, while the lowest abundance of heterotrophic bacteria and proteolytic bacteria was found with pesticides application alone, which coincided with the decline of soil microbial biomass. A consistent increase in the electron transport system activity was measured during the different crop growth stages of rice. The use of fertilizers (NPK) alone or combined with pesticides increased it, while a decline was noticed with pesticides application alone as compared with the control. The soil protein content was found to be relatively stable with fertilizers and/or pesticides application at various growth stages in both crops undertaken, but notable changes were detected at different growth stages.

Key words: nutrient management, pesticide management, soil microbial activity, hybrid rice