On the inter-relation of the growth retarding activity of the root-excretion among various kinds of fruit trees

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Abstract
1. This experiment was conducted with figs, peaches, Japanese pears, apples, Japanese persimmons, grapes, citrus trees and loquats to observe the inter-relation of the growth retarding activity of the root-excretion among various kinds of fruit trees. Young plants of each kind grown in Wagner's pots under sand culture were applied every day with such a large quantity of nutrient solution that a part of it would leak out from a hole at the bottom-side of the pot. The leaked solution which contained the root-excretion was caught in a vessel singly in each kind, and it was applied every day to the other young fruit trees of various kinds grown in clay pots.2. As the result, when the leaked solution of each kind was applied to the fruit trees of the same kind, their growth was retarded particularly in peaches, figs and grapes, followed by in Japanese pears, apples, loquats and citrus trees in the order, except for in case of Japanese persimmons. Furthermore, each leaked solution of peaches and figs retarded also the growth of fruit trees of other kinds when given to the latters.3. On the other hand, in peaches, figs and grapes, their growth was readily checked when serviced every day with the leaked solution of other kinds. Thus, with only a few exceptions, it became clear that the root-excretions of any two kinds of fruit trees would retard each other their growth in the similar order, the intra-class correlation coefficient of the retarding activity being+0.6014.

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