Plant soil correlation study

Plant soil correlation study number 11, vegetation, Organ Mountains in background. The vegetation is composed of 60 percent Acacia constricts, 20 percent Larrea glutinosa, 10 percent Ephedra trifurea, and 10 percent Kramaria parviflora. The average density is .25 and the forage acre factor is .04. Both sheet and wind erosion is slight. The soil is very shallow gravelly and stony, very fine sandy loam, only 10 inches deep. A hard very well cemented caliche layer having a dense crypto-crystalline surface, prevents plant roots with a few exceptions to penetrate below this depth. The slope gradient is 3 percent, the surface is practically level and bare with micro-relief not exceeding 2 inches. Original photo number 153.