雨季檬果高接試驗

AN EXPERIMENT OF THE MANGO TOP-WORKING IN RAINY SEASON

台灣檬果栽培，已逾四百年。根據統計資料，本地種及外來種共有五十餘品種，為中南部重要果產之一。往昔檬果僅為行道樹及庭園栽培；商業性大規模經營者不多。近年來由美國佛州引進之五個優良品種──Irwin.Zill,Kent.Haden及Keitt等已試種成功。有關當局為發展本省果產，拓展檬果生產前途，對新品種之繁殖與推廣，早已研擬宏遠之計劃。中南部果農極力合作，著手進行老樹更新，新闢園地，到處掀起種植熱潮。

1.This experiment was carried out in rainy season, as from early July through late September, at Chiayi and Talin in 1963. 2.The stocks used in this experiment were obtained from the tree of 6 to 30 years old; and their diameters were 10 to 40 cm. The scions were selected from the 4-year Irwin mango trees. The selected scions should be grown at least for 3 to 4 months and similar in growth vigor. 3.Two different grafting and wrapping methods were used in this experiment. The scions were all inserted into the bark of the stock as far 1.5 to 2 m.from the ground, on fineday. The treatments and their marks were listed below: a.Side grafting, wrapping with small plastic bag. b.Side grafting, wrapping with large plastic bag, the size may be enough to cover the cut surface of the stock. c.Top grafting, wrapping with small plastic bag. d.Top grafting, wrapping with large plastic bag, like L. S. 4.The results of this experiment were as follows: a.Top-working of the mango can be done on the fine day in rainy season at Chiayi, Taiwan. b.The survival percentage of grafting,, obtained from both treatments, S.S. and S. T. showed the highest amoung all. c.In the treatments of using large plastic bag for wrapping, the survival percentage of grafting was higher in the side grafting method than that o.f the top grafting. The survival percentage of grafting was·34.95% in treatment L.T. and was nearly 19.83 to 38.31% lower than the other treatments. d.The scions, which survived, gave rise to new bud from 21 to 42 days after grafted in all treatments. e.From the survival percentage of grafting, it is suspected that the lower survival of large bag wrapping may be due largely to the high moisture content Inside the bag, which caused the scions to rot. f.It is observed that the moisture content of the air and the amount of rain fall may be not related to the survival percentage of grafting of the treatments. However, the strong wind and the torrential rain usually accompanied by Tuphoon may cause some mechanical damage, such as shaking the grafting point. Under this condition, the grafting may be survived considerably lower.