Study On The Planting Regeneration,Yield And Quality Differences Of High-quality Rice Varieties Under Ratooning Planted In North Hunan Province

In order to promote the high-efficiency production of high-quality ratooning rice in Northern region of Hunan province,21 high-quality rice varieties including the check variety Taiyou390,have been collected from 21 seed companies and planted as ratooning rice experiment in Datonghu District Yiyang,Hunan in 2019.The differences among rice yield and quality traits of the main season and ratoon season,and the ratooning ability were analyzed.The main results were as following:1.The full growth period of the tested varieties is 185-234 days,including 128-150days in the first season and 57-89 days in the regeneration season.Based on the maturity period of the first season(before August 15)and the full season of the regeneration season(before September 10),Shengtaiyou 018,Kede Youxiangzhan,Xinfengyou 868,Wangliangyou 98 simiao,Chuangyu No.9,Lvyinzhan is suitable for regenerated rice cultivation in Northern region of Hunan province.2.The seedling-pile ratio of the tested varieties is higher than that of Taiyou 390(CK).The highest seedlings of Lvyinzhan,Xinfengyou 868 and Chuangyu 9 are higher than Taiyou 390(CK).The highest number of seedlings in the regeneration season of the tested varieties showed a very significant positive correlation with the seedling-pile ratio(R~2=0.4246**).3.There are significant differences in the first-season output,the regeneration-season output and the annual output among the tested varieties.The annual yield of the tested varieties was 634.2～1056.5 kg/667m~2,of which Longliangyou Lvsiiao,Yongyou 4953and Lvyinzhan were higher than CK.The yield of the tested varieties in the first season was435.2～718.7 kg/667m~2;the yield in the regenerating season was 177.7～475.9 kg/667m~2,among which the yield of regenerating seasons of Longliangyou Lvmiao,Yongyou 4953 and Lvyinzhan was significantly higher than that of CK.4.There are obvious differences in the rice quality among the tested varieties.The quality of the regenerated season rice of the tested varieties is superior to the quality of the first season rice.Among them,Wangliangyou 98 simiao,Xinfengyou 868,Zhenliangyou2018 and Yuanliangyou 199 are superior to CK(Ordinary),Lvyinzhan,Jingliangyou 1237,Jingliangyou 1212,Kede Youxiangzhan,Chuangyu 9,Jingliangyou 1206,Wangliangyou 98simiao,Xinfengyou 868,Zhenliangyou 2018,Yuanliang The quality of 199 regenerated seasonal rice is better than CK.Based on the results of comprehensive growth period,rice quality,yield and reproductive capacity,the variety Lvyinzhan accounted for the best overall performance.The first season matures before August 15th,and the regenerating season is full of ears before September 10.Both the rice quality and yield exceed the control varieties.The quality of the regenerating season rice is awarded Grade 2 by the Ministry of Quality and the output reaches 1038.9 kg/667m~2.It has strong germination ability and can be recommended as a high-quality regenerated rice variety for planting in Northern region of Hunan province.