Physiological Mechanism of High and Stable Yield of No-tillage Cast-transplanted Rice

After 4 years' successive comparative experiments, our results showed that the no tillage cast transplanted rice, compared with the conventional tillage cast transplanted rice, grew slower at the early stage and produced less tillers, but had shorter ineffective tillering time, less nutrition consumption, stronger individual growth and more coordinating growth between the individual and colony. All these contributed to increasing percentage of productive tillers and ear quality. Furthermore, the flag leaf of no tillage cast transplanted rice had higher photosynthetic rate during filling stage than that of conventional tillage cast transplanted rice and no early senescence phenomenon was found at late stage. These facilitated the accumulation and transportation of carbohydrate and improved grain setting rate.