激勃素（Gihberellin）對於促進番石榴幼樹發育及開花結實效應之研究

Studies on the Effects of Gibberellin on the Rates of Growth, Flowering and Fruit Setting in Guava(Psidium Guajava, L.)

1.激勃索對於番石榴中山種、印度種有促進植株發育之效。2.對於促進株高之生長，以100ppm之藥液處理區效果最著。3.促進莖粗之增長，則以50ppm處理區，效果最顯。4.100ppm之藥液對於促進枝之伸長，效果最佳。5.促進花數之著生，則以20ppm處理區為優。6.促進果實發育，以20ppm處理區，效果最為明顯。

This experiment was carried out from the month od May, 1962 to May, 1963 in the experimental garden of the Department of Horticulture, Chung-Hsing University, Taichung. Two varieties of guava, (Psidium Guajava, Linn.), namely, Chung shan and India. were used to observe the development of the growth of their young trees. Another part of this experiment was carried out with three varieties, Chung Shan, India and Kwangtung, to observe the effect of gibberellic acid on the folwering and the development of friuts these cariety. Four different concertrations of gibberellic acid soli=ution, 1 ppm., 10 ppm., 50ppm., 100 ppm. were used in the first part of this experiment. Two different concentrations of gibberellic acid solution, 1 ppm., 20 ppm. were used in the second part of this experiment. The results of this experiment are summarized as follows: 1.Gibberellin can stimulate the development of plants whieh belong to the varieties of Chung Shan and India of guava. 2.With regard to the stimulate of the growth in height of guava plants, the treatment of 100 ppm. gibberellic acid solution is most effective. 3.With regard to the stimulating of the growth in diameter of the trunk of guava plants, 50 ppm. is the most effective treatment. 4.100 ppm. gibberellic acid solution is most effective in stimulating the growth in length of the pranch. 5.20 ppm. plots is the most effective treatment to give large numbers of flowers. 6.Fruit development is biggest in 20 ppm. treatment plots.