Archive image from page 90 of Development and activities of roots. Development and activities of roots of crop plants; a study in crop ecology . developmentactiv00weav Year: 1922 Investigations at Burlington, Colorado. surface foot than those of wheat. Great mats of branches occurred in the surface 6 to 12 inches of soil, forming a profoundly developed absorbing system on all sides of the plant, even to a distance of 1 to feet. The working depth was about feet, while some roots reached a maximum of feet, where they encountered the very dry hardpan. Alfalfa, Medicago sativa. Alfalf
Archive image from page 90 of Development and activities of roots. Development and activities of roots of crop plants; a study in crop ecology . developmentactiv00weav Year: 1922 Investigations at Burlington, Colorado. surface foot than those of wheat. Great mats of branches occurred in the surface 6 to 12 inches of soil, forming a profoundly developed absorbing system on all sides of the plant, even to a distance of 1 to feet. The working depth was about feet, while some roots reached a maximum of feet, where they encountered the very dry hardpan. Alfalfa, Medicago sativa. Alfalfa was sowed at Burlington at the same time as the cereals already described, on April 15. On June 11, when the roots were examined, the plants were about inches high, although the tallest ones reached 6 inches. The stand was quite good, and the plants had a normal green color, but some wilted badly during the hottest part of the day. Hardpan occurred m this plat at feet depth. While the surface 6 inches of soil was very dry, below this a small amount of available water occurred to the hardpan layer (table 17). Most of the roots were about feet deep, although some were traced Fig. 31.—Alfalfa excavated at Burlington, June 28, 1921, during the second year of growth. to 2 3 feet. The root habit, especially in the surface soil, was quite like that described at Lincoln, but in the deeper layers the roots were found to be more abundantly branched. Moreover, the branches were longer and extended nearer the root-ends. . , , K A second examination was made on July 7, when the crop was about 5 inches high. Considerable variation in the development of the plants was noticeable, however, many being much smaller than the average and a few 8 inches tall. The trench was only a few feet from the preceding and the hardpan occurred at to feet depth. The soil, and especially the surface 8 inches, was very dry. Roots were abundant to the hardpan layer, but none extended be
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