Selection Experiment Of Middle Rice ＋ Ratooning Rice Varieties Suitable For Machine Planting In Southern Hunan

In order to screen out the varieties of ratooning rice suitable for cultivation in South Hunan,10 hybrid rice varieties from different sources were selected in the experiment,and the"first season rice+ratooning rice"variety screening experiment was carried out in niujiaoba Town,Lengshuitan District,Yongzhou City,South Hunan from March to November 2019.The growth cycle,agronomic characters,total yield of two seasons,contribution rate of yield at different nodes of ratooning rice,rice quality,disease resistance and ratooning ability of the tested varieties were comprehensively analyzed and studied,and the following conclusions were drawn.1.There were significant differences in the total yield of 10 varieties tested.The yield of the first season was 6976.5-11071.5kg/hm~2,the highest yield of Y Liangyou 9918 was11071.5kg/hm~2,the lowest yield of hengliangyou Xinhua viscosity was 6976.5kg/hm~2,the highest yield of regenerated rice was 2334.3-4951.3kg/hm~2,the highest yield was Yongyou4149,4951.3kg/hm~2,the lowest yield of hengliangyou Xinhua viscosity was 2334.3kg/hm~2,and the total yield of the two seasons was 9310.8-14 790.4kg/hm~2,the highest yield of y-liangyou-9918 was 14790.4kg/hm~2,and the lowest one was xinhuaguan,the lowest yield of the two seasons in the tested varieties,which was not suitable for the cultivation of Ratooning Rice Varieties in southern Hunan.2.The yield contribution rate of each node of ratooning rice of 10 tested varieties is as follows:inverted two nodes>inverted three nodes>inverted four nodes.Inverted two nodes and inverted three nodes have the largest contribution rate to the total yield of Ratooning season,accounting for more than 70%.Therefore,the principle of"keeping two nodes,keeping three nodes and competing for four five nodes"should be adopted in production to achieve high yield.3.The difference of regeneration rate among the tested varieties was significant.The rapid germination of the regenerated buds of Yongyou 4149 showed strong regeneration ability after harvesting,while the regeneration ability of Y Liangyou 475 was poor.4.The appearance quality of ratooning rice of the tested varieties was up to the standard of high quality rice,and the indexes of ratooning rice were improved compared with that of the first season rice.The milled rice quality of the ratooning rice and the first rice mainly lies in the difference of the rate of milled rice,which is 4.14 percentage points lower than that of the first rice,and there is no significant difference in other indexes.5.Before September 24,all of the tested varieties were able to Panicle in the south of Hunan Province.There was a risk that y you 475 and Guang Liang You 1128 could not safely Panicle in the south of Hunan Province.Whether the tested varieties can be planted in the south of Hunan Province is mainly determined by the performance of the total yield of two seasons,combined with the comprehensive consideration of growth period,regeneration ability,resistance and rice quality.The results showed that Yongyou 4149,Y Liangyou 9918,Shenyou475 and jingliangyouhuazhan had great potential for the cultivation of mechanically inserted Ratooning Rice in southern Hunan.