曹国军 陈国徽 周微 傅小平 吕太华 刘中来 谢国强

摘要 [目的]研究不同植物生长调节剂对再生稻产量及其构成因子的影响。[方法]以丰两优香1号和中浦优华占为试验材料，以不同促芽剂和920在机械收割2 d后下午对水225 kg/hm2进行喷施，对再生稻产量及构成因子进行研究。[结果]喷施促芽剂和920处理能打破再生芽的休眠，提高再生稻的发苗数和成穗率，增加单位面积有效穗数、结实率、每穗实粒数和株高，从而提高再生稻产量，增产幅度为7.9%～12.7%，增产效益显著。再生稻产量与实粒数、结实率和千粒重呈极显著的正相关，与品种再生力呈显著正相关。[结论]该研究为头季机械收割后再生季稳产高产提供了技术支持。

关键词 生长调节剂；再生稻；产量；构成因子

Effects of Different Plant Growth Regulators on Yield and Its Components of Ratooning Rice

CAO Guo-jun，CHEN Guo-hui，ZHOU Wei， XIE Guo-qiang* et al （Jiujiang Academy of Agricultural Sciences， Jiujiang，Jiangxi 332200）

Abstract [Objective] To study the effects of different plant growth regulators on yield and its components of ratooning rice. [Method] With Fengliangyouxiang 1 and Zhongpuyouhuazhan as the experimental materials， different promoter and 920 were sprayed with 225 kg/hm2 water in the afternoon after mechanical harvesting 2 days to study yield and its components. [Result]Spraying promoter and 920 treatment can break the dormancy of regenerated bud regeneration， improve rice seedling number and spike rate， increase the effective panicles per unit area， seed setting rate， grain number per panicle and plant height， so as to improve the yield of ratooning rice， increase by 7.9%-12.7%， increase production efficiency significantly. The ratooning rice yield showed extremely significant positive correlation with grain number， seed setting rate and 1 000-grain weight ，showed significant positive correlation with species regeneration ability.[Conclusion] The research provided technical support for stable and high yield in the first season after mechanical harvesting.

Key words Growth regulator； Ratooning rice； Yield； Component

再生稻在我國有着悠久的种植历史，可以追溯到1 700年前，具有一种两收，省种、省工、省水、省药、省秧田，栽培技术简单易行，米质好，食味佳，无污染等诸多优点[1-2]。再生稻种植是我国南方稻区提高复种指数和增加稻田全年生产力的重要措施之一。近年来，随着再生稻品种更新与生产技术的提高，再生稻生产发展很快，早中稻-再生稻种植面积逐年扩大，但再生稻区再生稻产量较低、效益不稳，制约着再生稻的发展[3]。

植物生长调节剂是人工合成的能够调节植物生长发育的化合物。目前已被证明具有调节作物生长、控制萌发和休眠、促进生根、防止落花落果、控制种子发育成熟等生理功能。中稻蓄留再生稻头季机械化收割将逐步扩大，头季机械收割造成稻桩受损，再生芽减少，成为限制再生季产量的因素[4-6]。……