- 農業気象 (ISSN:00218588)
- vol.17, no.1, pp.30-32, 1961
This study was made to investigate the pulling strengths between fruits and their stalks, and the resistance of fruits to wind in various fruits.<br>Among the pulling strengths between the shoots and the fruit stalks which were pulled towards different directions, the strength pulled towards basal direction was weahest, and followed, in order, by tangential, apical and radical direction. And also the pulling strengths among the various fruits were weak in following order: Japanese pear, apple, peach, fig, but in the case of the Unshu and persimmon fruits, the pulling strength could not be measured because their stalks had been broken in the middle by pulling. The pulling strength between the fruits and their stalks was weakest in the peach fruits, but strongest in the fig fruits.<br>The resistance of the various fruits to wind had tendency to increase in proportion to the cross sectional area of fruits, and increased slowly and proportionally with increasing wind velocity, moreover increased very rapidly when wind velocity reached more than 16 meters per second. The resistance of Japanese pear fruits bagged with news paper bags was five to eight times stronger than unbagged fruits.<br>If the wind velocity at which wind drops the bagged Japanese pear fruits is estimated from the data measured, these fruits will drop when the wind velocity rises over 17m/s.<br>If the velocity of fruits themselves, when blown by the wind and cut off stalks, shoots colliding with each other, is estimated, this velocity will be 0.45m/s for peach fruits, 0.31 for apple, and 5.5 for persimmon, respectively.