. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Boot and the Soil. 73 of the plant should, therefore, be aimed at promoting the formation of root-tips. In other words, we should encour- age root bratiching. * How may we do this 1 104. The Branching of Roots in land plants appears to depend much upon the amount of free oxygen (31) and available plant food which the soil contains, so long as the moisture supply is sufficient. In cultivated grounds having a compact sub-soil the roots of annual c
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Boot and the Soil. 73 of the plant should, therefore, be aimed at promoting the formation of root-tips. In other words, we should encour- age root bratiching. * How may we do this 1 104. The Branching of Roots in land plants appears to depend much upon the amount of free oxygen (31) and available plant food which the soil contains, so long as the moisture supply is sufficient. In cultivated grounds having a compact sub-soil the roots of annual crops usually branch most freely just at the bottom of, or a little below, the layer of soil stirred by the plow, this being the point at which the supply of oxygen, plant food and moisture are probably best suited to root growth. As the depth of tillage is increased, roots branch freely at a greater depth. Masses of decomposed manure beneath the surface of the soil are usually penetrated through and through with finely-branched roots; and fragments of bone in the soil are often inclosed in a mat of delicate rootlets. These materials furnish plant food in abundance. Boots that i^enetrate the deeper and more compact layers of soil, on the other hand, and those in poor and dry soils, are usually little branched. It is clear, therefore, that unless a Fig. 31. Showing how root soil is Well aerated (94) by a pruning stimulates root branching. proper System of tillage, and by. * Boot branches naust not be confounded with root-hairs. In Fig. 28, branches of the roots appear at e. e. e. The branches bear root-hairs when of sufficient length, but root-hairs never develop into branches. 5. 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. , The Author
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