Effects of Different Transplanting Densities on Agronomic Traits and Yield of Regenerated Rice

In order to investigate the effects of different transplanting densities on the growth, development, and yield of regenerated rice, an experiment was conducted in Nanya Town, Jianou City, Fujian Province in 2025, using Chunyou 167 as the material, to investigate the effects of different transplanting densities（16.67, 18.52, 20.83, and 238100 clusters·hm⁻²）on the growth period, agronomic traits, yield, and their constituent factors of rice. The results showed that as transplanting density increased, the effective panicle number of both the first and ratoon seasons significantly increased, while plant height, panicle length, grains per panicle, seed setting rate, and thousand-kernel weight exhibited a decreasing trend. At a transplanting density of 208,300 seedlings·hm⁻²（16 cm×30 cm), the plant population structure was more reasonable, achieving the highest combined harvested yield of 14903.58 kg·hm⁻², significantly higher than that at 166,700 seedlings·hm⁻²（20 cm×30 cm). In conclusion, a transplanting density of 208,300 seedlings·hm⁻²（16 cm×30 cm）is recommended for cultivating Chunyou 167 as ratoon rice in Jian'ou City.