Ecological investigations upon the germination and early growth of forest trees ecologicalinvest00boeruoft Year: 1916 PLATE III The Effeit of Soil Depth ri-ox Early Df:velopmext Fig. I. Tlie effect of soil depth upon the development of riiiiis poii- dcrosa (S. D.). Ten plants grown (i) in deep. (2) in medium, and (3) in sliallow soil. J/4 natural size. ^ m* f ^3fc^^ ,4 â 7 ' 1 2 .: i Fig. 2. The effect of soil depth upon tlie development of Robiiiin pseii- daeaeia. Three plants each (i) grown in shallow, (2) in medium. (3) in deep soil. 'â ; natural size.

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