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Irrigation and drainage.-Irrigated land as defined by the Bureau of the Census is the net acreage of farmland to which irrigation water was applied during the census year. It excludes land not irrigated during the census year and also irrigated nonfarm land.

In the 18 Western States (Alaska excluded) and Louisiana, the Bureau of the Census collects information at 10-year intervals on acres irrigated, irrigation works, capital investment, etc., from irrigation companies, districts, and other organizations, and from farms that operate their own irrigation works. Irrigation information for other States is generally limited to the regular farm census. Following the 1954 and 1959 Censuses, a special survey of irrigation was conducted in humid areas. The Bureau of the Census in 1950 and 1960 enumerated, in general, only organized enterprises with 500 acres or more of drained farmland. In 1950, smaller irrigation enterprises which had their own drainage works were also included. In previous censuses (1920 to 1940), all organized enterprises draining farmlands were included regardless of size. Privately drained lands of less than 500 acres have not been enumerated in any drainage

census.

Soil conservation.-Soil conservation district legislation has been enacted in all 50 States, Puerto Rico, and the Virgin Islands. A soil conservation district is a political subdivision of a State. Districts have broad responsibility and authority for conservation and development of soil, water, and related resources. In most cases, districts have authority to accept Federal, State, county, and private assistance for their soil and water conservation programs. On request of the local district governing body, the Department of Agriculture provides technical and other assistance.

Farm income.-Cash income is the cash receipts from farm marketings and represents quantities of agricultural products sold by farmers multiplied by prices received per unit of production at the local market. Gross farm income includes cash receipts and also Government payments, value of farm products consumed on the farm, and rental value of farm homes.

Historical statistics.-Tabular headnotes provide cross-references, where applicable, to Historical Statistics of the United States, Colonial Times to 1957. See preface.

FIG. XXXIX. FARM POPULATION, FARMS, AND FARM SIZE: 1940 TO 1964 [See tables 892 and 897)

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No. 892. FARM POPULATION AND COMPONENTS OF CHANGE: 1920 TO 1966 [In thousands, except as indicated. Prior to 1959, excludes Alaska and 1960, Hawaii. Figures for 1945 to 1959 are revised to provide a continuous series approximating the new definition of farm population; see text, p. 2. See Historical Statistics, Colonial Times to 1957, series C 74-79, for estimates for 1920 to 1944]

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1 Beginning 1940, includes inductions and enlistments into Armed Forces, and persons returning from Armed Forces. For all years, includes persons who did not move but who were in and out of the farm population because agricultural operations began or ceased, respectively, on the place where they were living. Total population includes Armed Forces abroad.

Source: Dept. of Agriculture, Economic Research Service, Farm Population, Estimates for 1910-62, 1963, 1964, 1965, and 1966.

No. 893.

FARMS-NUMBER AND ACREAGE: 1920 TO 1967

Prior to 1959, excludes Alaska and Hawaii. Estimated. For definition of farms and farmland, see text, p. 603. See also Historical Statistics, Colonial Times to 1957, series K1-2]

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1 Census years have been adjusted for underenumeration and for changes in definition of a farm; intercensal years are based on trend and on indications of change in acreage and livestock surveys.

Source: Dept. of Agriculture, Statistical Reporting Service; Number of Farms, 1910-1959; Land in Farms, 19501959, By States, 1962 (Statistical Bulletin No. 316), supplemented annually by Number of Farms and Land in Farms; and unpublished data.

No. 894. FARM OPERATOR HOUSEHOLDS AND INCOME FROM SOURCES OTHER THAN THE FARM OPERATED, BY STATES: 1964

[Money figures in millions of dollars. Preliminary. For composition of regions, see fig. I. p. xii]

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Source: Dept. of Commerce, Bureau of the Census; U.S. Census of Agriculture: 1964, preliminary reports, Series AC 64-P1.

No. 895. FARMS-NUMBER, By Size, 1940 to 1964, AND by Acreage, 1964 [Excludes Alaska and Hawaii. See also Historical Statistics, Colonial Times to 1957, series K 61-72]

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Source: Dept. of Commerce, Bureau of the Census; U.S. Census of Agriculture: 1950, Vol. II, 1954, Vol. II, 1959, Vol. II, and 1964, Vol. II.

No. 896. FARMS-NUMBER, ACREAGE, AND VALUE OF SALES, BY SIZE OF SALES: 1949 TO 1964

[Excludes Alaska and Hawall. Value of farm sales expressed in prices received by farmers in 1959]

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Source: Dept. of Agriculture, Economic Research Service; unpublished data. Data based on Census of Agriculture, Bureau of the Census.

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670,835

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313

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7,240

28,591
32, 945

100.0

4.7

10.8

84.5

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No. 897.

FARMS-NUMBER, Acreage, and VALUE, BY STATES: 1959 and 1964 [For composition of regions. see fig. I, p. xii)

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Based on average value per acre for farms in sample for which value of land and buildings was reported. * Average for farms reporting value of land and buildings. Excludes Alaska and Hawaii. Source: Dept. of Commerce, Bureau of the Census; U.S. Census of Agriculture: 1964, Vol. I.

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