. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PLANT SUCCESSIOlsr AND RANGE MANAGEMENT. 49 small wheat-grass cover, but also to the comparatively high propor- tion of humus, and hence water-holding power, of the wheat-grass soil. Data showing the more important chemical constituents and humus content of representative soils supporting short wheat grass and of soil supporting ruderal weeds are given in Table 6. Except in the amount of potash, the percentage of the chemxical constituents im- portant as plant food is higher in the soils representing the small wheat-gr
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PLANT SUCCESSIOlsr AND RANGE MANAGEMENT. 49 small wheat-grass cover, but also to the comparatively high propor- tion of humus, and hence water-holding power, of the wheat-grass soil. Data showing the more important chemical constituents and humus content of representative soils supporting short wheat grass and of soil supporting ruderal weeds are given in Table 6. Except in the amount of potash, the percentage of the chemxical constituents im- portant as plant food is higher in the soils representing the small wheat-grass lands than in the soils characteristic of the ruderal-weed cover. The most strilring difference is found in the total nitrogen. 20 Fig. 20.—Available and nonavailable soil moisture on an overgrazed area supporting a sparse stand of ruderal vegetation, 1915. content. Also there is a wide difference in the humus content as de- termined by incineration. Table 6.—CJieniical properties of soil supporting small ichent grass and soil sup- porting the ruderal-iveed consociation. Soil. Lime (CaO). Potash (K^O). Phosphoric acidCP205). Total nitrogen. Loss by- ignition (humus). Small wheat grass Per cent. Per cent. Per cent. .22 Per cent. .158 Per cent. Ruderal weed 112655°—Bull. 791—19-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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