Pedosphere 13(2): 129--138, 2003
ISSN 1002-0160/CN 32-1315/P
©2003 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Combined effect of nutrient and pest management on soil ecological quality in hybrid rice double-cropping system
LIAO Min, XIE Xiao-Mei and A. SUBHANI
Natural Resources Science Department, College of Environmental and Resources Sciences, Zhejiang University, Hua Jiachi Campus, Hangzhou 310029 (China)
      The mineral fertilizers (NPK) and pesticide, including herbicides, insecticides and fungicides, were applied alone or in combination and the soil sampling was done at different growth stages during the crop cycle to study the changes in soil organic matter, microbial biomass and their activity parameters in a paddy soil with different nutrient and pest management practices in a hybrid rice double-cropping system. A consistent increase in the electron transport system (ETS) activity was measured during the different crop growth stages of rice. The use of fertilizers (NPK) alone or with pesticides increased ETS activity, while a decline of ETS activity was noticed with pesticides alone as compared with the control. Nearly an increasing trend in soil phenol content was observed with the progression of crop growth stages, while the usage of pesticides alone caused maximum increments in the soil phenol content. The soil protein content was found nearly stable with fertilizers and/or pesticides application at various growth stages in both crops taken. But notable changes were noticed at different growth stages probably because of fluctuations in moisture and temperature at particular stages, which might have their effects on N mineralization. Marked depletions in the phospholipid content were found with the advancement of crop growth stages, while the incorporation of fertilizers and/or pesticides also produced slight changes, in which a higher decline was noticed with pesticide application alone compared with the control.
Key Words:  electron transport system (ETS), hybrid rice, phenol, phospholipid, protein
Citation: Liao, M., Xie, X. M. and Subhani, A. 2003. Combined effect of nutrient and pest management on soil ecological quality in hybrid rice double-cropping system. Pedosphere. 13(2): 129-138.
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