In order to probe into the effect of agricultural technology on biological character in soil and prowae sclentllic proof for reasonable culturing system, the studies on effect of no tillage or minimum tillage on the microbial flora and its activity in paddy soil covered with 1/3 straw were conducted. The results showed that:When the microbial character was analysed at early-rice-harvested stage, late-rice maximum tillering stage, late-rice maximum booting stage and late-rice-harvested stage, the quantities of the main groups of microbes and mi...