Effects of rice based cropping system and organic manure on microbes and enzyme activities in paddy soils derived from red earth

The effects of the rice-based cropping system and organic manure on microorganisms and enzyme activity in paddy soils derived fron1 red earth were studied．The results show that the three main groups of microbes in mils and some special physiologic groups microbes are obviously affected by different cropping systems and organic manures．The enzyme activities in paddy soils derived from red earth and soil fertility Call be improved by the optimal cropping system and organic manure ．