Root studies of four varieties of spring wheat
1938
Hubbard, V.C.
The number of fibrous or hair roots per 2-cm section of the roots, and the weight per unit section of the roots of four varieties of spring wheat differing in yield at the Northern Great Plains Field Station, Mandan, N. Dak., and believed to differ in drouth resistance, were determined for different soil levels to a depth of 36 inches in 1933 and 1934. Diameter measurements of the roots of Ceres and Hope were taken at three soil levels. The number of seminal roots per plant penetrating to a depth of 3 feet or more was also determined which, multiplied by the number of hair roots per root, may be regarded as an index of the number of hair roots per plant. Ceres and Reliance were found to have slightly more hair roots per unit section of root than Marquis and Hope and they likewise appeared to have a larger number of hair roots per plant. The differences were greater than can be explained by random errors, but nevertheless were not entirely consistent at different soil levels. The data are regarded as indicative only of a relation between yield under conditions of drouth and numbers of hair roots per unit length of root and per plant. Differences in diameter and weight of roots per unit length were observed but little evidence was secured to indicate a relation between these differences and yield or drouth resistance.
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