Abstract:

To study the better rice-straw returning, this experiment used different treatment on early and late rice respectively by using coverage returning, stubble breaking land-returning and compost counters-field these three different rice-straw returning. After rice-straw returning, to study the early rice growth, yield quality and influence the status of soil fertility, in order to get the better rice-straw returning. In the late rice processing, in the meanwhile, through the rice-straw returning with different types and quantity the chemical fertilizer and degradation bacterium to study the late rice soil biological activity changes (micro-flora change, soil enzymes activity change). The results showed that, for early rice yield and soil nutrient status, compared 3000 kg/hm2 stubble breaking land-returning both other treatment had good effect. For late rice on trend of microbe and enzyme, rice-straw returning with the chemical fertilizer can effectively increase the number of bacteria in the soil, including stubble breaking land-returning 3000 kg/hm2 plus 225 kg/hm2 compound fertilizer with the highest number of bacteria. The rice-straw returning with the chemical fertilizer and degradation bacterium can increase catalase and urease activity, but not affected obviously in soil invertase.