. Carnegie Institution of Washington publication. Investigations at Peru, Nebraska. 37 soil was quite too low for maximum root development during the cold rainy month of April (c/. Lehenbauer, 1914). During May, a slow but uniform rise occurred, while differences between the temperatures on June 9 and 23 were quite pronounced. This ushered in a hot, dry period which extended to July 4. It is interesting to note that the deeper soils into which the new roots were extending were progressively colder. Undoubtedly temperature has a marked influence upon crop-root development under field conditions
. Carnegie Institution of Washington publication. Investigations at Peru, Nebraska. 37 soil was quite too low for maximum root development during the cold rainy month of April (c/. Lehenbauer, 1914). During May, a slow but uniform rise occurred, while differences between the temperatures on June 9 and 23 were quite pronounced. This ushered in a hot, dry period which extended to July 4. It is interesting to note that the deeper soils into which the new roots were extending were progressively colder. Undoubtedly temperature has a marked influence upon crop-root development under field Fig. 15.—Soil-temperaturea at various depths during 1919. May June July August 5 12 19 36 2 9 16 23 30 8 15 22 29 7 12 20 25. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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