Response of Rice( Oryza sativa L. ) in Cold Regions to Dry Matter Formation in Different Culture Models

[Objective]To compare the influence of 3 production modes( two-segment culture,greenhouse culture,and direct sowing) on the yield and dry matter formation of rice,and explore the relationship between different seedling culture models and high yield in the third temperature accumulation zone. [Method] Study greenhouse disk culture and direct sowing of Kongyu 131,greenhouse disk culture,two-segment culture and direct sowing of Longjing 21,greenhouse disk culture and two-segment culture of Longjiao 04-192 and Longdao 5,two-segment culture of Songjing 9. For greenhouse culture,choose 30 cm × 15 cm,3-4 plants per hole,sowing on April 22; for two-segment culture,30 cm × 20 cm,2 plants per pot,sowing on May 28,transplanting into disks on April 22; for direct sowing,sowing 150 kg / hm2in strips on May 25. [Result]Two-segment culture has the earliest full heading,and higher flower quantity per spike; direct sowing has the latest full heading, but higher spike quantity per unit area; greenhouse disk culture has higher maturing rate and thousand-kernel weight,and higher yield. Distribution of spike and aboveground dry matters is narrower in direct sowing than in greenhouse culture,but distribution of leaf dry matter wider than the latter. Spike dry weight distribution increases from direct sowing,to greenhouse culture,and two-segment culture. [Conclusion]The research provides references for the high-yield rice cultivation in the third temperature accumulation zone in Heilongjiang.