24 COSTS OF PRODUCING SUGAR BEETS the value of good plowlands in Michigan was reported to be 7.8 per eent greater in 1921 than in 1922 and 3.9 per cent less in 1923 than in 1922. Consequently to obtain the land charges for 1921 and 1923 the 1922 land charges as obtained in the field investigation were in- creased 7.8 per cent for 1921 and reduced 3.9 per cent for 1923. Yields for the three years.—The yields per acre for 1921, 1922, and 1923, were obtained from the farmers themselves and were checked against the factory records except in Michigan and Ohio, where the 1923 crop had not been harvested when the investigators were in the field. For these two States the 1923 yields were determined from data furnished by the United States Department of Agriculture. The 1922 yields for the farms investigated were increased or decreased for 1923 in proportion as the yields for that year deviated from the 1922 yields. If the average yield for all farms in a given locality was 10 per cent lower in 1923 than in 1922, the average 1923 yields for the farms investigated were determined by reducing the 1922 yields for these farms by 10 per cent. Method of weighting.—The annual averages for each State for 1921 and 1923 were arrived at by weighting on the basis of the 1922 produc- tion, the three-year average by weighting the commission’s data for each year by the total production of the State as reported by the Yearbooks of the United States Department of Agriculture. The averages for the United States were obtained by weighting the State costs by the total production of the State in each of the three years, respectively, as shown in the Yearbooks of the Department of Agri- culture, and are combinations of data for the nine States only. Additional data.—In addition to the data on the costs of production and returns to the growers, the commission obtained, for the area investigated, much supplemental information on the economic status of the sugar-beet industry—its present limitations, the possible in- crease in beet acreage under existing conditions of farm management, the effect of the sugar-beet crop upon yields of other crops planted subsequently on the same ground, the effect of the beet-sugar factories upon land values, and other valuable data. SCOPE AND REPRESENTATIVENESS OF THE INVESTIGATION The commission desired to obtain data which would show the costs of producing sugar beets in the various regions and for the country as a whole. As it was, of course impracticable to obtain costs from all growers, representative areas in the chief producing regions were selected. The records obtained for the 22 selected areas cover 2,242 farms in the nine States—Michigan, Ohio, Nebraska, Colorado, Utah, Idaho, Wyoming, Montana, and California. These nine States produced 94 per cent of the total beet tonnage and included 92 per cent of the acreage of sugar beets harvested in the United States in 1922. The area investigated produced 12.1 per cent of the total tonnage and was 10.4 per cent of the total acreage planted in sugar beets in the United States that year. The percent- age of the production investigated in the individual States ranged from 6.5 in Idaho to 27.3 in Wyoming. For the individual areas so visited the commission’s figures cover from one-fifth to one-half of the beets produced. The beets for which cost data were obtained were manufactured into sugar in 58 of the 81 beet-sugar factories operating in the United States in 1922.