化學藥品及剪除花穗對檬果花期調節及結果之效應

Effect of Chemical Treatments and Inflorescence Pinching on the Regulation of Flowering Date and Fruit Setting of Mango Tree (Mangifera indica L.)

愛文檬果植株自67年9月15日起至67年11月30日止，每隔半個月分別噴250ppm Ethrel, 4000ppm Alar, 50ppm GA₃共噴六次。其中250ppm Ethrel可提早花期約二星期、4000ppm Alar約可提早花期一星期、50ppm GA₃約可延後花期五星期；可能受氣候影響對著果數各處理間無顯著差異。50ppm GAs有增加花穗長度之現象，4000ppm Alar可縮短花穗長度並增加雄性花比率。又愛文檬果植株以60倍Agriblum溶被分別處理一次、二次及三次者，對調節花期作用不甚明顯，對著果數影響亦不明顯。在花季中將愛文檬果已開之頂端花穗自基部完全去除後，則靠近頂端處之腋芽可分化為花芽、抽穗開花，並延遲開花約三星期，然對著果數影響不顯著。

Studies were conducted on the effect of chemical treatments and infloresecnce pinching on the regulation of flowering date and fruit setting of Irwin mango (Mangifera indica L.), in which Ethrel, Alar and GA₃ were applied separately at 15 days interval. Results are summarized as follows: 1. Bloom period was proceeded two weeks earlier by Ethrel (250 ppm) treatment and one week earlier of the Alar (4,000 ppm). But it was delayed five weeks in GA₃ 50 ppm treatment. 2. Owing to climate conditions, no significant difference of fruit set between treatments was found. 3. Panicles were elongated by treatment of GA₃ (50 ppm); but shortened by Alar (4,OOO ppm) treatment even the number of pistillate flower was increased. 4. No effect of Agriblum spraying was found. 5. Blooming showed again while the inflorescence was removed and no effectiveness on fruit setting was recorded.