. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Stem. 7S 112. Relation of Roots to Food Supply. Boot growth is relatively less, in the extent of ground occupied, in moist and fertile soils, than in poorer and drier soils, but the roots are proportionally more branched. In wet seasons, a given plant has less extensive root development than in drier sea- sons, because the roots may secure the needed food and water from a smaller area. Nurser}- trees grown on fertile soils have a more compact r
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Stem. 7S 112. Relation of Roots to Food Supply. Boot growth is relatively less, in the extent of ground occupied, in moist and fertile soils, than in poorer and drier soils, but the roots are proportionally more branched. In wet seasons, a given plant has less extensive root development than in drier sea- sons, because the roots may secure the needed food and water from a smaller area. Nurser}- trees grown on fertile soils have a more compact root system than those grown on poorer soils. 113. Root Tubercles. Plants belonging to the pulse family (natural or- der Legumiuosae (le-gu- mi-no'-sae)), of which the clover, pea and bean are familiar examples, when grown in ordinary soil, have swellings or tuber- cles on their roots (Fig. 31). These are caused by parasitic fungi known as bacteroids (bac'-te-roids) and are of special interest, because the bacteroids producing them render nitrogen of theair, which plants have no power to directly appropriate, available as plant food (260). Section VIII. The Stem 114. As the root develops from the base of the hypo- cotyl, the plumule, or primary shoot (56), develops from the. Fig. 31. YouDg clover plant showing tu- bercles (t) on roots. (From nature).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. : E. S. Goff
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