Abstract:

To screen for new double-cropping rice varieties suitable for cultivation in Zhejiang，this study conducted a demonstration trial of new varieties in Zhuji City，Zhejiang Province，in 2024. Using Zhongzao39 and Yongyou1540 as control varieties，we comprehensively evaluated the major agronomic traits of 20 early rice and 14 continuous-cropping late rice varieties. The results showed that the early rice variety Shunda135 had the highest yield（679.1 kg per 667 m²），an increase of 18.2% compared with the control. The yield of late rice variety Jiafengyou2 reached 732.2 kg per 667 m²，an increase of 15.3 % compared with the control. Varieties such as Yongyou59 exhibited a balanced performance in terms of yield and lodging resistance. This study screened early rice varieties and continuous cropping late rice varieties with excellent comprehensive traits through comprehensive analysis of yield and resistance，providing a scientific basis for the renewal of double-cropping rice varieties in northern Zhejiang.

Key words: double-cropping rice, variety comparison, agronomic trait, yield, Zhejiang