Abstract:

Sowing time and seedling age are the significant factors influencing early rice yield. This study utilized the early indica rice variety Yongxian 980 as the experimental material to investigate the impact of seedling age on the yield of Yongxian 980. A total of four seedling age(20, 25, 30, and 35 days) treatments were implemented. The results showed that there were significant differences in plant height and leaf age of seedlings at different ages, but no significant differences were observed throughout the overall growth period. In terms of yield traits, although the 35-day-old treatment increased the number of tillers, it also reduced the number of effective panicles. Moreover, the panicle formation rate, total grain number per spike and yield were all lower than those of other treatments. The 20-day-old treatment had a relatively small impact on the main agronomic traits of rice. However, due to the short seedlings, they were prone to frost damage and waterlogging after planting. Overall, the transplanting seedling age of Yongxian 980 was preferably 25 to 30 days. This study provides a theoretical basis for the selection of sowing time and the promotion and application of Yongxian 980 in Jinhua City.

Key words: early indica rice, Yongxian 980, sowing time, seedling age, yield