Comparative study on Triangle System of Rice Intensification (SRI) with Square System of Rice Intensification, Throwing-transplanted Rice and traditional cultivation - 水稻三角形强化栽培与正方形强化栽培、抛秧栽培、常规栽培的比较研究

Abstract

The characters of growth and development and the formation of grain yield in triangle SRI were studied in this paper to supply the practice basis in rice production. The triangle SRI with different planting density was compared with square SRI, throwing-transplanted rice and traditional cultivation under different level of nitrogen supplied in order to study the changes of relationship between population and individual of rice, characters of formation and translocation in population source-sink, plant senescence in later growth stage and yield formation characters. The results indicated that, triangle SRI and throwing-transplanted rice harvest was higher than grain yield by increasing more number of effective panicle and decreasing individual quality to some extent, but the triangle SRI with suitable density had more advantage than throwing-transplanted rice and square SRI obviously. Square SRI also obtained high grain yield by improving the individual growth and its yield components if population was enough. Triangle SRI and square SRI with suitable density had bigger LAI, more accumulation of matter, higher export amount and export percentage and translocation percentage of stems and sheaths to panicle than throwing-transplanted rice and traditional cultivation in its late growth period. Triangle SRI and square SRI with suitable density had higher productive potential. The grain yield of high N supplied (225 kg/hm2) was higher by 6.36% than that of medium N supplied (150 kg/hm2). It indicated that, proper increase of N supplied level was favor of higher grain yield for SRI.