Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 48 Elementary Principles of Agriculture They also take in some of the substances that are dis- solved in the soil moisture. Root-hairs give off carbonic acid gas and possibly other acids, which help to dissolve some substances in the soil. This may be easily demon- strated by allowing roots to grow on a polished marble slab. 77. The Amount of Root Growth is large. A plant must have a large root surface to absorb enough water to make up for the loss from a large leaf surface. A large le
Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 48 Elementary Principles of Agriculture They also take in some of the substances that are dis- solved in the soil moisture. Root-hairs give off carbonic acid gas and possibly other acids, which help to dissolve some substances in the soil. This may be easily demon- strated by allowing roots to grow on a polished marble slab. 77. The Amount of Root Growth is large. A plant must have a large root surface to absorb enough water to make up for the loss from a large leaf surface. A large leaf surface is, of course, beneficial, because it means so much more surface for absorbing the carbon dioxid and energy from the sun's rays. There must, however, be a balance between the activities of the root surface and the leaf surface. 78. The Distribution of Roots in the soil varies with the kind and condition of the soil, but, roughly, the Fig. 31. When trees are dug up, the large roots are found spreading ia the 6rst few feet of soil. These roots had a spread of forty feet.
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