Maricopa Series. 135 



12 3 4 



Soil (3) 7 33 26 27 



Subsoil (3) 9 39 26 22 



Acres. 

 Salt River Valley, Ariz 20, 650 



Maricopa silt loam. — A heavy brownish silt loam, with a depth 

 of 6 feet or more. The soil has an exceedingly iine texture, crum- 

 bling to an impalpable powder when dry, but becoming very 

 sticky when wet. It is easily puddled, bakes upon exposure to 

 the sun, and somewhat resembles an adobe in physical character- 

 istics. Erodes into vertical walls, washes, and gullies. Except as 

 very small particles, the occurrence of gravel on the surface is rare. 

 Occurs in valleys and along streams. Generally level, except 

 where cut by washes. Native vegetation is sparse and often want- 

 ing on wind-swept areas. Both surface and subdrainage is apt to 

 be deficient. Some alkali accumulations where irrigated. Best 

 adapted to alfalfa, wheat, barley, sorghum, Egyptian and Indian 

 corn, and sugar Vjeets. 



12 3 4 



Soil (2) 1 7 68 25 



Subsoil (3) 19 56 25 



Acres. 

 Solomonsville, Ariz 11,648 



Maricopa clay loam. — Stiff reddish clay loam, 6 feet or more in 



depth. Low valley land. Colluvial soil, heaviest product of the 



wash from the mountain slopes. Adapted to grain crops, but 



rather heavy and compact for alfalfa. 



12 3 4 



Soil (1) 10 21 38 31 



Subsoil (1) 2 15 53 29 



Acres. 

 Lower Arkansas Valley, Colo . . . 832 

 Salt River Valley, Ariz 8, 713 



Maricopa sandy adobe. — A yellowish-brown or reddish sandy 

 adobe 6 feet or more in depth. Occupies lower levels. Drainage 

 good. Owes its origin to stream wash and disintegration of rocks 

 in place. Contains some alkali. Alfalfa principal crop, but good 

 yields of sorghum, corn, wheat, and oats are produced. 



12 3 4 



Soil (2) 7 50 28 16 



Subsoil (2) u 45 -Jl 26 



Acres. 

 Lower Arkansas Valley, Colo. . . 37. 284 



