頁籤選單縮合
題名 | SNA 對增加鳳梨春果果重之效果=Ues of SNA Sprays to Improve Weight and Size of Spring Fruit of Pineapples in Taitung District |
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作者 | 鄺健雄; 丘應模; | 書刊名 | 中華農學會報 |
卷期 | 62 民57.06 |
頁次 | 頁31-43 |
關鍵詞 | SNA; 鳳梨; 春果; 果重; |
語文 | 中文(Chinese) |
英文摘要 | The experiments on the determination of the effect of SNA (Sodium Salt of Naphthalene acetic acid) spray on improving fruit weight and size of the spring fruits of pineapples, which were forced to flowering by calcium carbide about one year after planting, were carried out in Chih Pen, Li Chia, Pin Lang, Pan Chiu and Chu Lu under Taitung conditions for three crop years. The concentrations of the SNA spray were 100, 200, 300 and 400 ppm; the amount used was about 50cc per fruit. The dated of the spray treatments were in the three decades of February when the pineapple fruits were about half developed. In other words, the spray treatments were given in about 2 months before the fruit ripening. The results are summarized as follows: 1. The SNA spray could raise pineapple fruit weight by 10-45%. On average, the mean fruit weight increments of 100 ppm, 200 ppm, 300 ppm and 400 ppm plots were 12%, 15%, 23%, and 19%, respectively. The average fruit diameter increased by about 5%. For a better result, the concentration of SNA to be resommended is 300 ppm. The proper time of treatment of SNA spray is 50 to 60 days before the ripening of spring fruits. 2. The higher the number of fruit eyes, or the bigger the orginal size of fruit, the greater was the effect of SNA in increasing the fruit weight and size. In the case of the size 1 fruit the fruit weight was increased by 32%, while the weight of size 3 fruits was only raised by 13%, as compared with their checks. 3. The SNA treatment had a delay effect on fruit maturity. The maximum delays were shown to be about two weeks. But the degree of delay effect fluctuated according to the extent of increase of fruit weight due to SNA spray. In other words, the better the effect on the increase of fruit weight, the greater was the effect on the delay of fruit maturity. It is supposed that the maturity delaying effect allowed the fruit to have more time to develop, thus, resulting in bigger fruits. 4. The acidity of the treated fruit was decreased, and its total sugar content was also lower than that of the untreated fruits. When the fruit was harvested, the phenomenon of guttation on the broken peduncle of the SNA-sprayed plant was manifest. It showed the fact that SNA seemed to have an effect on adding the ability of water absorption of the plant. This caused the treated fruit to have a higher water content and a high percentage of flesh-soung fruits, which are known by the pineapple grower here to have good quality. According to the inspection data of the canned fruits, there seemed to be no big difference in quality between the treated and untreated plots. 5. The diameter of the core of the treated fruit was larger than that of the untreated one. Since the development of the fruit eyes was different between the treated and untreated part, so a localized spray of SNA could cause the deformity of the fruit. This is why we should make sure that an even distribution of SNA spray is made on the surface of the fruit. 6. The appearance of the sucker of the teated plant was a little slower than that of the untreated one. But they had the same fruiting percentage. This indicates that SNA spray may have no material effect on the yield of the 1st ratoon. |
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