Effect of Rice Straw Returning with Decomposing Inoculants on Soil Physico-Chemical Properties and Late Rice Yield

In order to understand the effect of early rice straw returning and decomposing inoculants added on physico-chemical properties of soil, the growth of late rice and economic benefits, the field experiment was carried out with 3 kinds of straw-decomposing inoculant as material. The results showed that the decomposition agent facilitated the rapid decomposition of rice straw at earlier stage and released nutrient from straw. After adding the decomposition agent, the contents of soil organic matter, available nitrogen and rapidly available potassium had improved 0.2~0.3 g/kg, 4~8 mg/kg and 14.0~18.6 mg/kg respectively, and the CEC increased 0.2~0.4 cmol/kg. There were many other advantages, such as improving the growth of late rice with higher plants, more effective ears bearings, longer ear of rice and advanced setting percentage, and having significant yield-increasing effect. The increase production of the 3 kinds of straw-decomposing inoculant was averagely over 30 kg/667m2, with a rate of growth of over 5%. Taking out of the cost, there was a increment of45.8yuan/667m2 averagely.