. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. 10 Development and Activities of Roots of Crop Plants. others as far as feet from the base of the plant. Thus, the spread of these shallow roots had increased 4 or 5 inches since May 29. These horizontal roots often continued their course near the surface of the soil. Frequently, throughout their whole length, no portion of them could be found that was deeper than to 3 inches. Other roots extended almost parallel with the surface for a distance and then turne
. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. 10 Development and Activities of Roots of Crop Plants. others as far as feet from the base of the plant. Thus, the spread of these shallow roots had increased 4 or 5 inches since May 29. These horizontal roots often continued their course near the surface of the soil. Frequently, throughout their whole length, no portion of them could be found that was deeper than to 3 inches. Other roots extended almost parallel with the surface for a distance and then turned downward, ultimately reaching depths of 1 to 5 feet. Still others descended almost vertically until they reached depths of 5 to feet or more, the maximum length found being feet. Fig. 1.—A. Root system of University No. 21 oats 59 days old. B. Swedish Select oats 60 days old. (fig. 2 a). 5 to 7 of these deeper roots were commonly found. This is an increase of 4 or 5 over those present at the time of the preceding examination. The roots were all profusely branched with fine branches ranging from to 4 inches in length. This was especially true of those lying near the surface, where the branches were longest. On practically all of the roots at this time the branches extended almost to the tips. The roots were very fragile, especially the deeper ones. The shrunken and shriveled cortex indicated that considerable material had been transported from them. The soil was fairly well filled with roots to a depth of feet, and below this to feet they were quite numerous. Thus, it is evident that the root system of this. 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 Weaver, John E. (John Ernest), 1884-1966; Jean, Frank Covert, 1880- joint author; Crist, John W. , joint author. Washington, Carnegi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcropsan, bookyear1922
