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[目的]研究不同播期对水稻秧苗素质的影响,为确定晚季的最佳播种期提供理论依据。[方法]通过对3个水稻品种6个不同播期情况下生长的秧苗的地上部和地下部性状调查,确定双季晚稻最佳播种时期。[结果]第1叶鞘高与第2叶长呈极显著的正相关,且他们的二次拟合方程具有很好的拟合性。3个水稻品种的不同播期对地上部和地下部的影响都有显著差异。[结论]初步确定广东地区双季晚稻品种天优428的最佳播种期在6月25 ~7月2日,天优998和玉香油占晚季的最佳的播种期在7月2 ~9日。
[Objective] The research aimed to study the effects of different sowing date on the quality of rice seedling and provide the theoretical basis for determining the optimal sowing date in late season. [Method] The optimum sowing date of double cropping late rice was determined through the investigation of the aboveground and underground traits of seedlings grown under 6 different sowing dates in 3 rice varieties. [Result] The first leaf sheath height had a very significant positive correlation with the second leaf length, and their quadratic fitting equation had a good fit. The effects of different seeding dates of three rice varieties on aerial part and underground part have significant differences. [Conclusion] The optimal sowing date of double cropping late rice variety Tianyou 428 in Guangdong was preliminarily determined from June 25 to July 2, and the best sowing date of Tianyou 998 and jade oil accounted for late season from July 2 to September 9 day.