Abstract:

In order to solve the problems of tight season and low yield of continuous cropping late rice, the growth characteristics and yield of six high-yield hybrid rice varieties were compared. The results showed that the yield per 667 m² of Yongyou 59, Huazhongyou 9326, Jiafengyou 2 and Yongyou 31 was 12.0%, 14.0%, 15.4% and 16.4% higher than that of the control variety Yongyou 1540, respectively. The main reason for the increase in yield of Jiafengyou 2 and Huazhongyou 9326 compared with the control variety was the increase in the number of grains per spike and thousand grain weight, and the main reason for the increase in yield of Yongyou 31 and Yongyou 59 compared with Yongyou 1540 was the increase in the number of grains per panicle. The growth period of the tested varieties was extended by 1-6 days compared with that of the control varieties. In terms of production, the growth period of early and late rice varieties can be matched, and the hybrid rice varieties with suitable growth period can be selected for continuous cropping late rice machine transplanting.

Key words: continuous cropping late rice, hybrid rice, indica and japonica hybrid rice, machine transplanting, yield