A Note on the Relation of Root Growth in the Soil to the Oxygen Supply: The Growth Ratio

摘要: In the environment of land plants there are two factors especial importance aside from very obvious ones soil and water. These temperature rate supply oxygen to roots. As is known, a variation in temperature, other being equal, produces direct root growth. Similarly it can be said that partial pressure atmosphere soil, provided low, like results.' It aim present paper point out features temperature-oxygen relation roots, namely, (i) how an increase or decrease affects growth presence low pressure, (2) coincidence between amount necessary produce certain rates absorption capacity water for at temperatures used. A deficient limiting factor any degree which characteristic species. Under such conditions expression defining desirable. For this purpose ratio, relative as regards conveniently employed. This defined observed given with respect (r) divided by expected same but under normal aeration relations (R), giving r/R. has been found least ratio may species, what extent case will require much intensive work, would expected. above defined, appears have striking characteristics. constant its value varies inversely temperature. And directly latter small.