Abstract:

In order to reveal the pattern of straw decay and the process of soil nutrient change, this article continuous 2-year field experiment to study the of straw Fertilizers different ratio of chemical fertilizers on late rice yield and soil fertility. The results show that the straw fertilizer ratio of fertilizer significantly increased late rice production, the yield increase of 8.5%-21.5%, the difference between the treatments significantly. In addition to the SN2 (straw, fertilizer N 225 kg/hm2) and SP1 (straw and P 75 kg/hm2), the rest of the processing straw biomass than the control single application of straw biomass declined in the range of 3.3%-13.7%, the district between the two groups no significant difference among treatments was significant difference. Straw fertilizer ratio of fertilizer treatment significantly improves the effective panicles of late maturity, the number of grains per panicle, seed setting rate and grain weight. Stepwise linear regression equation indicated that the seed setting rate was the most important factor of late rice production. Compared with the control straw fertilizer different ratio of fertilizer was to improve soil pH, total nitrogen, available nitrogen, organic carbon, available phosphorus, total phosphorus, potassium and total potassium, and lower soil C/N ratio, which straw Fertilizers NPK treatment effect was remarkable. So straw and chemical fertilizer, fertilizer needs a combination to further play the comprehensive benefits.