Effects Of Waterlogging On Growth And Yield Components Of Rice

Due to the growth of rice in flood disasters period, it is necessary for us to research rice waterlogging. But the existing studies has little impact floods for rice growth process analysis. In this paper, by flooding experiment, we analyzed the waterlogging on rice growth and yield constitutes. The main conclusions of this study as follows:(1)With the increasing number of the days, the photosynthetic rate of rice is reducing. The reduction in relative photosynthetic rate in half submerged less than full submerged. When in the same depth and days at three periods (Tillering stage, Booting Stage, Grain filling stage), relative photosynthetic rate in booting stage affected the most obvious and the most difficult to recover, tillering stage secondly, no significant changes in grain filling stage. When in the same flooding conditions, the relative photosynthetic rate recovery in Liangyoupeijiu is faster than Nanjing45.(2)The impact of floods on rice substance distribution index, green leafy substance distribution index increases with the number of days is reducing, and the reducing rate increases after flooding 5 days, then gradually restored to CK until about 25 days after waterlogging. Panicle substance distribution had no obvious effect at tillering stage. Booting stage by floods, especially in full submerged 3d and 6d have great impact on panicle material distribution. In particularly, spike material was partitioned small and difficult to restore after 6d in full submerged. Flood disaster has little effect on spike at grain filling stage, and the leafy distribution index showed an increasing trend.(3)When suffered by full submerged, the heading time delayed the most obvious at tillering stage in nanjing45. Similarly, Liangyoupeijiu had the same regularity but the heading time was later than Nanjing45. This shows that the ability to resist flood disaster in Liangyoupeijiu is stronger than Nanjing45. The analysis of heading time at spike development stage in 2014. It may be conclude that Liangyoupeijiu can be able to withstand, because the heading time of the same group in Nanjing45 was delayed significantly in Liangyoupeijiu.(4)For yield, the full submerged 6d and 10d has great impact on yield at fillering stage. When waterlogged at booting stage, full submerged three treatments (1d,3d,6d) on seed setting rate, grain weight and yield were affected, there were significant differences between the treatment and CK, especially the two species suffered 10d waterlogged were almost crop failure. When full submerged at grain filling stage, the production is still affected.In this paper, based on the spatial and temporal distribution of flooding disasters in Jiangsu Province, comprehensive analysis of the impact of flooding disasters on puberty, photosynthesis, dry matter partitioning and yield and yield structure. And it has a certain practical significance for rice production.