| Abstract: | Four pairs of minor civil divisions in the United States and the USSR are compared to determine differences of agricultural land use in areas with similar soils and heat and moisture supplies. In the United States, crops exceed animal products as a source of farm income only in the driest area. In the Soviet Union, crops are the principal source of farm income in both dry and more humid areas. This is related to the fact that the United States produces forage grasses and forage root crops mainly in more humid areas, while the Soviet Union relegates forage crops to a secondary role after bread grains and industrial row crops. Grain yields in the United States rise markedly from drier to more humid areas. In the Soviet Union the highest yields are achieved in the moderately dry chernozem zone. |
