. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE &MM BULLETIN No. 328 ^SYt~'x2^' Contribution from the Bureau of Plant Industry 4Usr&Ju WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER December 30, 1915 MILLING AND BAKING TESTS OF WHEAT CON- TAINING ADMIXTURES OF RYE, CORN COCKLE, KINGHEAD, AND VETCH. By R. C. Miller, Assistant in Charge of Dockage Investigations, Office of Grain Standardization. CONTENTS. Introduction 1 Frequency of occurrence of impurities in wheat 2 Comparison of the specific gravity of whe
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE &MM BULLETIN No. 328 ^SYt~'x2^' Contribution from the Bureau of Plant Industry 4Usr&Ju WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER December 30, 1915 MILLING AND BAKING TESTS OF WHEAT CON- TAINING ADMIXTURES OF RYE, CORN COCKLE, KINGHEAD, AND VETCH. By R. C. Miller, Assistant in Charge of Dockage Investigations, Office of Grain Standardization. CONTENTS. Introduction 1 Frequency of occurrence of impurities in wheat 2 Comparison of the specific gravity of wheat and of its impurities 2 Methods of preparation and milling 3 Descriptions of the different impurities 5 Comparative milling yields of wheat and of its impurities 10 Milling and baking tests of wheat contain- ing impurities 10 Tests with flour blends 17 Tests with wheat containing kinghead 18 Tests with wheat containing wild-vetch seed, as grown 19 Analyses of wheat, of the impurities, and of flour containing admixtures 20 Special cleaning devices 22 Mechanical analyses of corn-cockle screenings. 22 Summary 23 INTRODUCTION. Wheat as grown and as marketed frequently contains various kinds of so-called inseparable impurities, such as rye (Secale cereale), corn cockle (Agrostemma giihago), kinghead, or great ragweed (Ambrosia trifida), and wild vetch (Vicia angustifolia). These impurities are considered inseparable, inasmuch as they are not readily removed from wheat by the grain-cleaning machinery in general use in grain elevators and flour mills, because of their similarity in size, shape, and specific gravity to the wheat in which they occur. Millers claim that the presence of these impurities in wheat in appreciable amounts injures the milling and baking qualities of the flour. The result is that wheat which cpntains a noticeable amount of these ingredients when marketed is generally penalized by being Note.—The data presented in this bulletin are applicable to the
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