Effects of Mulching Mode on Canopy Physiological,Ecological Characteristics and Yield of Rice under Dry Cultivation

The effect of mulching mode on leaf physiological and population ecological characteristics of rice was studied by using super hybrid rice combination P88S/1128 as material under three mulching cultivation modes and bare cultivation (control). The results showed that mulching mode had a significant effect on micro-meteorological factors and individual growth of rice.There was a significant reduction of rice canopy temperature in hot season,especially in high-temperature periods. Under mulching cultivation,relative humidity increased,creating good micro-climatic conditions. At the same time,leaf transpiration increased,leaf temperature decreased under mulching cultivation,which improved the tolerance of rice to high temperature stress,thereby significantly enhanced photosynthetic rate. The yield components under mulching cultivation were obviously improved. With the highest grain number per paincle and seed setting rate,the yield under plastic film mulching cultivation was increased by 16.81% compared to the control. Under straw mulching cultivation,the number of effective panicles increased,leading to a yield increase of 9.59%. However,the rice yield under the liquid film mulching had no significant difference with that of the control.