. Bulletin. Agriculture. DETAILED STUDY OF SOIL TYPICAL OF EXTENSIVE AREAS. 29. Fig. 18.—Diagram showing the effect of calcium sulphate upon nitrification of ammonium sulphate in samples of soil from plat 300, Truckee-Carson Experiment Farm, representing poor soil "A "; plat 310, representing poor soil " B"; and plat 320, representing good soil. Table Yll.—Nitrate formed from nitrite by samples of soil from plats 330 and 350, Truckee-Carson Irrigation Project, in medium for nitrate bacteria. Incubated at 28° C. Nitrate Nitrate formed in formed in Charac- No. of plat. Depth
. Bulletin. Agriculture. DETAILED STUDY OF SOIL TYPICAL OF EXTENSIVE AREAS. 29. Fig. 18.—Diagram showing the effect of calcium sulphate upon nitrification of ammonium sulphate in samples of soil from plat 300, Truckee-Carson Experiment Farm, representing poor soil "A "; plat 310, representing poor soil " B"; and plat 320, representing good soil. Table Yll.—Nitrate formed from nitrite by samples of soil from plats 330 and 350, Truckee-Carson Irrigation Project, in medium for nitrate bacteria. Incubated at 28° C. Nitrate Nitrate formed in formed in Charac- No. of plat. Depth of 10 davs 20 days ter of (parts per (parts per soil. million). million). Inches. 330 0-6 Poor. 6-12 12-18 18-24 90. 32 350 0-6 Good. 6-12 72. 25 12-18 18-24 211. 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. Bureau of Plant Industry. Washington : G. P. O.
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