Study on Seedling Quality of Double-cropping Late Rice Sowed at Different Dates in Guangdong

不同时期对广东双季晚稻秧苗素质的影响研究(英文)

[Objective] The aim was to study seedling quality of rice sowed at different dates so as to provide theoretical basis for determining the best seeding time.[Method] By investigating the characters of shoot and root of different varieties sowed at different dates,the best seeding time of double-cropping late rice was determined.[Result] The first leaf sheath height and the second leaf length shared significantly positive correlation,which fit the quadratic equation well.The effects of different sowing dates on shoot and root of three rice varieties appeared significant difference.[Conclusion] The best seeding time of Tianyou428 was in June 25-July 2 and that of Tianyou998 and Yuxiangyouzhan was in July 2-9.

[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。