Abstract:

In order to clarify the characteristics of the new hybrid rice variety ‘Liangyou 2189’ and its application prospect in production, this study used the data of regional test of middle indica rice in the southern rice area of Henan Province from 2021 to 2022 and the production test data in 2023. The correlation analysis and path analysis of its yield and components were carried out, and the results of rice quality detection and resistance identification were systematically studied. The results showed that the average yield of ‘Liangyou 2189’ in the three-year test were 9295.5 kg/hm², 9651.0 kg/hm², and 9930.0 kg/hm², which increased yields compared with the control variety, and the yield increase rate were 87.5%, 100%, and 100%. The variation coefficients of the yield in two-year regional test were 4.53% and 9.12%, both smaller than the control variety. The high stability coefficients in three-year test were 89.85%, 87.23%, and 92.75%, all higher than the control variety. Among the three elements of yield, the variation coefficient showed: thousand grain weight<grain number per<effective spike number. Thousand grain weight was the most stable, the direct effect played a major role, and effective spike number had the largest variation range, the contribution rate to yield was the largest. In actual production, the key of achieving high yield is to increase the number of basic seedlings, increase the rate of tillers, achieve multiple panicles, take into account the number of grains per panicle and 1000-grain weight, and coordinate the relationship between the three. In summary, the ‘Liangyou 2189’ is a new variety with high yield and stable yield, which can be widely promoted and planted in southern Henan Province and similar ecological areas.

Key words: hybrid indica rice, ‘Liangyou 2189’, characteristics, high yield and stable yield, variation coefficient, high stability coefficient, yield