The Research on Dry Matter Accumulation of Super-rice Varieties in Cold Area

Regulation of dry matter accumulation were systematic researched on super-high-yield rice variety which use Dongnong-423, Longdao-5, Songjing-3 and Songijng-9 as test material and use Songjing-6 as control, The result indicated that accumulation rate of dry materials showed no significant difference on different varieties before the booting stage, and from booting stage to full heading stage its difference increased noticeably. During the whole growing period, dry matter accumulation of varieties were different and the difference was significant. There were significant positive correlation between dry matter accumulation per unit and yield(correlation = 0.904). There were significant positive correlation between dry matter accumulation and yield in the middle and late growth period(correlation = 0.897 and 0.928), it showed that the advantage of dry matter accumulation on high-yield rice variety in the middle and late growth period.