Gai Panpan, Chen Yuanwei, Sun Xin, Chen Hongjing, Yang Desheng, Ren Miaofei, Liu Lei, Wang Weiqin, Zheng Huabin, Tang Qiyuan
School of Agronomy, Hunan Agricultural University, Changsha, China.
Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, China.
Front Plant Sci. 2025 Aug 26;16:1630992. doi: 10.3389/fpls.2025.1630992. eCollection 2025.
Based on "forage-grain ratoon rice," the planting pattern of a high-grain-yield ratoon crop (RC), supplemented by fodder, can be regulated by the cutting time and stubble height.
In 2021 and 2022, using Xiangliangyou 900 as the experimental material, field trials were conducted to investigate differences in the yield formation of regenerated tillers from different nodal positions under varying cutting times (i.e., 10 and 30 days after heading, T10 and T30, respectively) and stubble heights (i.e., 10 and 30 cm, H10 and H30, respectively).
The results showed that the average grain yield of T10 was 80.48% higher than that of T30, while the average grain yield of H30 was 21.77% higher than that of H10. Analysis revealed that the higher yield of T10 could be attributed to the panicle per square meter and the grain filling, while the higher yield of H30 could be attributed to the panicle per square meter. Analysis also revealed that the panicle per square meter and the grain filling of regenerated tillers at different nodes in T10 were higher than those in T30, while the yield performance of regenerated tillers at different nodes in H was more complex. Further analysis revealed that, under the H30 treatment, the grain yield generally followed the order D4 > D3 > D2, with D3 and D4 contributing approximately 84.80% of the total yield on average. In contrast, under the H10 treatment, D3 exhibited a higher yield than D4, with D3 contributing approximately 58.05% of the total yield. Notably, the D3 yield under H10 was higher than that under H30, while D4 showed the opposite trend.
Reasonable cutting times and stubble heights are important factors to increase the yield of the ratoon season.
基于“粮草再生稻”，以饲料为补充的高产再生季作物（RC）种植模式可通过收割时间和留茬高度来调控。
在2021年和2022年，以湘两优900为试验材料，进行田间试验，研究不同收割时间（即抽穗后10天和30天，分别为T10和T30）和留茬高度（即10厘米和30厘米，分别为H10和H30）下不同节位再生分蘖产量形成的差异。
结果表明，T10的平均稻谷产量比T30高80.48%，而H30的平均稻谷产量比H10高21.77%。分析表明，T10产量较高归因于每平方米穗数和籽粒充实度，而H30产量较高归因于每平方米穗数。分析还表明，T10中不同节位再生分蘖的每平方米穗数和籽粒充实度高于T30，而H中不同节位再生分蘖的产量表现更为复杂。进一步分析表明，在H30处理下，籽粒产量总体上遵循D4>D3>D2的顺序，D3和D4平均贡献总产量的约84.80%。相比之下，在H10处理下，D3的产量高于D4，D3贡献总产量的约58.05%。值得注意的是，H10下D3的产量高于H30下的，而D4则相反。
合理的收割时间和留茬高度是提高再生季产量的重要因素。
