ITS WONDERFUL ROOT SYSTEM
In its root growth it is probably the greatest wonder among plants. While it usually grows no higher than four or five feet (although it has been known to reach more than ten feet; an unirrigated stalk is on exhibition at the office of the Kansas Board of Agriculture, measuring nearly seven feet) and its normal height is about three feet, its roots go down ten, twenty, or more feet, and one case in Nevada is reported by Charles W. Irish, chief of Irrigation Inquiry United States Department of Agriculture, where the roots were found penetrating through crevices in the roof of a tunnel one hundred and twenty-nine feet below the surface of an alfalfa field. Prof. W. P. Headden of Colorado found roots nine feet long from alfalfa only nine months old, and another reports roots seventeen inches long of but four weeks’ growth, the plants being but six inches high. It usually has a slender taproot, with many branches tending downward, yet with considerable lateral growth. As the taproot is piercing the earth it is also sending out new fibrous roots, while the upper ones, decaying, are leaving humus and providing innumerable openings for air, the rains, and fertilizing elements from the surface soil. The mechanical effect of this root-growth and decay in the soil constitutes one of the greatest virtues of the plant, and by its roots alfalfa becomes, self-acting, by far the most efficient, deep reaching subsoiler and renovator known to agriculture.