38 Yearbook of the Department of Agriculture, 1921, 



f2_ ^ g -. S, S. S. K P( o 2 ^ M ffi * S, ^. 



Fig. 35. — The grain sorghums are, perhaps, our most drought-resistant crops. The 

 expansion of acreage during the past two decades in the southern Great Plains area 

 has been eitraordinarv. Fiom 1899 to 1909 the acreage in the United States increased 

 from 206,000 to 1,085,000, or sixfold, and between 1909 and 1919 it more than doubled. 

 Buckwheat, which is p>raetically confined to the Appalachian area and the Lake States, 

 has decreased slightly in acreage since 1909. It is peculiarly adapted to districts having 

 cool, moist summers and sour soils. 



The velvet bean, grown as a forage crop, has increased greatly its acreage in the 

 Southeastern States, where the boll weevil has discouraged cotton growers and a\yakened 

 interest in live-stock production. (See Figs. 22 and 81.) 



