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Visible injury to fruit trees due to sulfur dioxide fumigation 2. some interior factors playing an important role to the difference of sensitivity among five fruit trees


Visible injury to fruit trees due to sulfur dioxide fumigation 2. some interior factors playing an important role to the difference of sensitivity among five fruit trees



Bulletin of Hokkaido Prefectural Agricultural Experiment Stations 56: 9-18



In part I, we reported about the difference of sensitivity to SO2 among five kinds of fruit tree such as pear, peach, grape, apple and chestnut tree. In this report, some factors playing a important role to the difference of sensitivity among test trees were examined. The first main factor was the degree of sulfur absorption into leaf under fumigation and the second other main one was a buffering capacity to decrease in pH values of water extracts of leaves due to absorption SO2. Concerning the first factor, the sulfur content of leaf at the time on first appearance of acute injury and the tolerable limit of sulfur content under long period fumigation were examined further. Sulfur content in leaf was increased with increase of fumigation time or gas concentration. The increased rate of sulfur content under fumigated treatments differs from the kinds of fruit trees and was the lowest in pear tree. About the second main factor, we examined two subfactors. That is, the decrease in pH values under the added treatments of HCL and the increased combined acid under fumigation were corresponded respectively to the rapidly decrease and the slowly decrease in pH values of water extracts under fumigated treatment. The ranking of the buffering capacity gotten from the decreased rate in pH values under the added treatments of HCL were chestnut

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