Abstract: A field experiment was conducted to study the effects of different fertilizations on yields of rice and paddy soil microbial biomass. The results showed that eco-fertilizer combined with organic fertilizer could obviously enhance rice yield and improve yield components, and the yield increased by 10.5% compared with organic fertilizer treatment. Yields of rice in plot used chemical fertilizers increased by 8.1%, but yields of mineral powder mingled with organic fertilizer treatment and organic fertilizer treatment were almost equal. The peak value of chlorophyll content (SPAD value) in rice was observed on 15 d after transplanting under the normal planting condition with chemical fertilizer, while it was observed on 80 d after transplanting under organic fertilizer treatment. The mean soil microbial biomass-C in the treatment of NST was higher during whole rice growth stage, CK was the second, and GP showed a decrease compared with CK and its variation coefficient was the highest.

Key words: fertilization measures, rice growth, soil microbial biomass-C, organic culture, conventional culture