香子兰[Vanilla fragrans(Salisb.)Ames(V.planifolia Andr.)]是一种名贵的食品香料植物,我国引进后至今仍处于试种阶段。我所在玻璃温室种植条件下,曾出现过香子兰落花落荚(植物学上称为蒴果)较为严重的现象。落荚率曾高达84.2%。而国内外未见有关利用生长素防止香子兰的花和果荚脱落的报道。为此布置了本试验。结果表明2,4—D有明显防止香子兰果荚脱落的效果;而2,4—D和NAA对防止香子兰落花虽然有些效果,但由于人工授粉(CK)的座果率也很高,因此其实用价值甚少,现把试验结果整理于下: Vanilla fragrans (Salisb.) Ames (V. planifolia Andr.)] Is a valuable food spice plants, after the introduction of China is still in the trial stage. Under the condition of planting glasshouse in my own place, the phenomenon of falling drop of vanilla (botanically known as capsule) has appeared more serious phenomenon. Fall pod rate was as high as 84.2%. No reports of the use of auxin to prevent the fall of flowers and fruit pods of vanilla were found at home and abroad. To this end arranged the test. The results showed that 2,4-D had a significant effect on preventing the fall of vanilla pods. However, 2,4-D and NAA had some effects on preventing the drop of vanilla. However, because of the high fruit-setting rate of artificial pollination (CK) So its practical value is very small, now put the test results in the next: