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Effects of nutrient and pest management on soil microorganism in hybrid rice double-annual cropping system

Sheng, Z.L., Min, L., Yong, H.C., Abid, S.
Communications in soil science and plant analysis 2005 v.36 no.11-12 pp. 1525-1536
Oryza sativa, rice, hybrids, double cropping, soil bacteria, community ecology, soil ecology, heterotrophs, soil enzymes, enzyme activity, oxidoreductases, phospholipids, cells, paddy soils, environmental impact, nontarget organisms, pesticide application, temporal variation, developmental stages, NPK fertilizers, fertilizer application, China
Combined effects on soil microbial activity of nutrient and pest management in hybrid rice double-annual cropping system were studied. The results of a field experiment demonstrated significant changes in soil phospholipid content, heterotrophic bacteria, proteolytic bacteria, and electron transport system (ETS)/dehydrogenase activity studied with different management practices and at different 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 produced slight changes, lowest microbial biomass phospholipid content was found with pesticides-alone application. A decline in the bacterial abundance of heterotrophic bacteria and proteolytic bacteria was observed with the continuance of crop growth, while lowest abundance of heterotrophic bacteria and proteolytic bacteria were found with pesticides-alone application, which coincided with the similar decline of soil microbial biomass. A consistent increase in ETS activity was measured during the different crop growth stages of rice. The use of fertilizers (NPK) alone or fertilizers and pesticides increased it, while a decline was noticed with pesticides-alone application as compared with the control.