. Classification of American wheat varieties. Wheat; Wheat. CLASSIFICATION OF AMERICAN WHEAT VARIETIES. 47 in Figure 18. In short brush the hairs are less than mm. long, in midlong brush from to 1 mm. long, and in long brush more than 1 mm. long. All durum wheats and some varieties of common wheat, such as Bobs and Prelude, have a short brush. A few very long hairs may be present in a short brush. Humpback and Mealy are varieties of common wheat having a long brush. Both the size and the length of the brush are very constant characters, probably the most constant kernel characters asid
. Classification of American wheat varieties. Wheat; Wheat. CLASSIFICATION OF AMERICAN WHEAT VARIETIES. 47 in Figure 18. In short brush the hairs are less than mm. long, in midlong brush from to 1 mm. long, and in long brush more than 1 mm. long. All durum wheats and some varieties of common wheat, such as Bobs and Prelude, have a short brush. A few very long hairs may be present in a short brush. Humpback and Mealy are varieties of common wheat having a long brush. Both the size and the length of the brush are very constant characters, probably the most constant kernel characters aside from color and size. In machine thrashing, part of the hairs of the brush frequently are removed. The brush area of some varieties is here described as "collared" (Fig. 17, d). Cobb (71) referred to this as an abrupt margin. This refers to the presence of a distinct raised collar or flange of bran along the margin of the brush area. This is most noticeable on shrunken kernels, but is very distinct on normal kernels of a few varieties, such as Goldcoin and e Fig. 18.—Brush length: a, Short; ~b, midlong; c, long. (Natural size and enlarged 3 diameters.) PHYSIOLOGICAL CHARACTERS. Several characters of wheat varieties of interest to growers can not be observed in a morphological examination. These differences are of a physiological or in- ternal nature. They are of great eco- nomic importance, but are of little value in classification. Following the descrip- tions of many of the varieties, therefore, certain of the physiological characters here mentioned are considered. The leading physiological characters of importance in wheat varieties are productivity, milling and bread-making values, resist- ance to low temperatures, and resistance to diseases. PRODUCTIVITY. A comparison of yield is of value only in comparing different vari- eties of wheat grown under identical conditions, as side by side, on identical soil, or in one locality in the same season. Unde
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