著者

林 真二 脇坂 聿雄

出版者

一般社団法人 園芸学会

雑誌

園芸学会雑誌 (ISSN:00137626)

巻号頁・発行日

vol.25, no.1, pp.59-68, 1956

被引用文献数

3

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In the present paper, the results of the experi-ments on the relation between oxidation-reduction potentials, Fe^.. and H₂5 contents in soils, and the submersion tolerance or excess-moisture injury of the fruit-tree roots are reported with special reference to fig, peach, pear, apple, persimmon and grape. The results are summarized as follows.<br> 1. The growth of fruit-tree shoots were stopped by excess-moisture or water-lodging in the soils having following values of Eh₆<br> Fig 360_??_370m. v.<br> Peach 330_??_350m. v.<br> Pear and Apple 260_??_280m. v.<br> Persimmon 200m. v.<br> Grape 170_??_180m. v.<br> Shoot growths of pear, apple, persimmon and grape were inhibited gradually from the neigh-bourhood of ca. 300m. v.<br> 2. Fe^..-formation in soils increased as the oxi-dation-reduction potentials failed, and the amount of Fe^.. extracted by HCl (pH 3) solution was ca. 20mg at 300m. v., ca. 30mg at 200m. v. and 60_??_70mg at 100m. v., per 100g. dry soil. There-fore, the root system of fig or peach was impeded mainly by oxygen-deficiency before Fe^.. was formed abundantly in soil. On the other hand, the impediment of root system in the case of pear or apple was derived from a large amount of Fe^.. formed by remarkable reduction in soils, and moreover, when approximately 30 mg Fe^..<br>was formed in soils on persimmon or grape.<br> 3. When the soils were water-lodged, the higher organic matter content in soil, the more rapid Eh falling and more the amounts of Fe^.. and HsS formed. Accordingly, the more high organic matter content in soil, the more remarkable the injury of root system of fruittree caused by excess-moisture.<br> 4. Fig and peach were susceptible, pear was middle and grape and persimmon were resistant. Parallelism between resistance of root system to Fe^.. and H₂S, and submersion tolerance of root was found. And it was suggested that the differ-ence of resistance to excess-moisture injury was caused by the difference of oxidation power of root towards the exterior.