. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. PLATE 11. A. Development of crop on March 12 in fertilized soil. B. In unfertilized 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, Carnegie Institution of Washington

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcropsan, bookyear1922