SOIL SURVEY OF THE EED BLUFF AREA, CALIFORNIA. 



21 



the best drained section of the valley. The ujDland soils are always 

 deficient in organic matter, but can be improved under irrigation 

 and hy the addition of green manures. Alkali is nowhere present. 

 Even ordinary care in the use of irrigation water will relieve this area 

 of all the danger fi-om alkali so frequently resulting in other irrigated 

 sections. 



The following table gives the names and extent of the various soil 

 types found in the Red Bluif area : 



Areas of different soils. 



Soil. 



Tehama silt loam 



Tuscan stony sandy loam 



Sacramento silt loam 



Corning gravelly loam 



Coming loam 



Sandy phase 



Redding loam 



Sacramento fine sandy loam . . 



Vina fine sandy loam 



Maywood loam 



Tuscan stony loam 



Vina clay loam 



Rough stony land 



Bedding gravelly sandy loam. 

 Vina loam 



Deep silty phase 



Vina clay adobe 



Deep phase 



Soil. 



Tehama gravelly loam 



Sacramento silty clay loam. . . 



Elder silt loam 



Riverwash 



Maywood silt loam 



Maj'wood gravelly sandy 



loam 



Elder silty clay loam 



Tehama clay 



Maywood fine sandy loam 



Kirlvwood silty clay adobe 



Sacramento fine sand 



Elder gravelly fine sandy 



loam 



Mavwood siltv clav loam 



Acres. 



4,032 

 3,584 

 3,392 

 3,200 

 2,308 



2,048 

 1,600 

 1,536 

 1,536 

 1,536 

 896 



832 

 384 



Total 208,640 



Per cent. 



1.9 

 1.7 

 1.0 

 1.5 

 1.2 



KEDDING LOAM. 



The Redding loam in some of its general features resembles the 

 gravelly sandy loam of the same series, but in agricultural value 

 there is a marked difference. This type is remarkably uniform and 

 consists of a loam, yellowish red to red in color, sticky and boggy 

 when wet, and carrying considerable quantities of medium-sized 

 waterworn material. The coarser particles range in size from sand 

 and subangular fragments to rounded gravels 2 inches or more in 

 diameter, quartz often predominating. Such quantities of coarse 

 material, which would usually render a soil rather friable, fails in 

 this case materially to improve the tilth. This is due to seasonal 

 conditions, saturation being quickly followed by a compact puddled 

 state, rendered somewhat worse by a low content of organic matter. 

 This surface loam at G to 18 inches grades sharply into a subsoil 

 closely resembling that of the Redding gravelly sandy loam, being 

 a red clay or clay loam of impervious, slightly indurated structure. 

 The subsoil carries some embedded gi'avel and cracks freely on ex- 

 posure. It is in this case, however, of a darker red color and much 



