Analysis on system of rice intensification (SRI) localization and dry matter production characteristics of high-quality rice.

System of rice intensification(SRI) is a new theory of rice high-yield cultivation,proposed by scientists of Madagascar and America.This system is characterized by high yield potential,seed and water saving techniques and introduced in China in 1999.In the present study,by combining the key techniques of rice intensification cultivation(proposed by China National Rice Research Institute) and high-yield cultivation techniques of high-quality rice in Guangxi,a preliminary localization SRI technique was developed,using a new conventional quality variety Liyuanzhan 1 as the test material.Two planting density,viz.,S-1(30cm×30cm,11.25×104/ ha) and S-2(23cm×20cm,21.45×104/ ha)were used and the physiological and biochemical indexes viz.,proline content and MDA content in leaf,dry matter accumulation,leaf area index,the tiller dynamics and some other parameters measured,and economic traits of each treatment were surveyed.The conventional cultivation technique was used as the control.The results showed that,under this preliminary intensification system,the maximum tiller number,ear-bearing percentage,effective panicle number per hole,grains per panicle,grain weight per hole and dry weight per hole were higher comparing to conventional cultivation treatment.Further,this technique could save time and labor cost,prolong the growth period of rice,release the vast growth potential of the rice plant and improve the drought resistance capacity of rice plant.Moreover,the yield of rice was increased significantly due to contradiction between individual rice and its population were well coordinated with suitable planting density.