A graphic summary of American agriculture, based largely on the census of 1920 ... . Fig. 21.—The eastern half of the United States produced in 1919 about 86 pev centof the value of all crops of the Nation ; the value of the crops produced in the CottonBelt and the Corn Belt being nearly 50 per cent. The value of the crops per squaremile of land area was about . in the Corn Belt, and $8,700 in the Cotton Belt, to only $673 in the Arizona-California Desert Region ; but the value per acrein crops was highest in the .irizona-California Desert ($95), where all crops areirrigated,
A graphic summary of American agriculture, based largely on the census of 1920 ... . Fig. 21.—The eastern half of the United States produced in 1919 about 86 pev centof the value of all crops of the Nation ; the value of the crops produced in the CottonBelt and the Corn Belt being nearly 50 per cent. The value of the crops per squaremile of land area was about . in the Corn Belt, and $8,700 in the Cotton Belt, to only $673 in the Arizona-California Desert Region ; but the value per acrein crops was highest in the .irizona-California Desert ($95), where all crops areirrigated, and lowest in the Great Plains Region ($21), where most of the crops aregrown under semiarid conditions. 434 Yearhooh of the Department of AgricvZture, Figs. 22 and 23.—The northern boundary of the Cotton Belt Is approximately theline of 200 days average frost-free season (see Fig. 5) and 77° mean summer temperature,the southern boundaiy that of 11 Inches autumn rainfall, because wet weather inter-feres with picking and damages the lint. This southern boundary is now moving north-ward, as the milder winter temperatures near the Gulf and longer season permit in-creased injury by the boll weevil. The western boundary of cotton production withoutIrrigation is approximately the line of 23 inches average annual rainfall (see Fig. 4).The densest areas on the map are districts of richer soils, notably the Black Prairie ofTexas and the Yazoo Delta (see Fig. 6), or heavily fertilized soils, especially those of thePiedmont and Upper Coastal Plain (see Fig. 109). A Graphic Smnmonj of American Agriculture. 435
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
