. Bulletin. Agriculture. 12 SOILS OF THE TRUCKEE-CARSON IRRIGATION PROJECT. NITRIFYING POWER OF SOILS AT DIFFERENT DEPTHS. In investigations in soil bacteriology in the eastern United States only the surface soil shows great variations. The soil of the arid sections is much deeper, however; that is, the subsoil is less ''raw" than in regions of heavier rainfall, a fact that has come to be more or less familiar to everyone studying soil conditions over extensive areas. Figure 2 shows the nitrification of samples from plats 100 and 110. These plats, which are practically duplicates, are in
. Bulletin. Agriculture. 12 SOILS OF THE TRUCKEE-CARSON IRRIGATION PROJECT. NITRIFYING POWER OF SOILS AT DIFFERENT DEPTHS. In investigations in soil bacteriology in the eastern United States only the surface soil shows great variations. The soil of the arid sections is much deeper, however; that is, the subsoil is less ''raw" than in regions of heavier rainfall, a fact that has come to be more or less familiar to everyone studying soil conditions over extensive areas. Figure 2 shows the nitrification of samples from plats 100 and 110. These plats, which are practically duplicates, are in a productive I I I I 80 70 60 50 40 30 20 10 0 -10 DEPTH /IT WH/CH S/IMPLES l^ERE T^^/fif/V. tOW__6"7tJl2" l2"rol8" (8'ro24" 24ro36" 5ulphofi S:fM_/J0_^ z^^ ,^ •—-^ CMor/ds -P/af //o '~~—~-. ?&//?<? 600 700 600 500 400 300 200 100 0 -100 I I I Fig. 2.—Diagram showing the nitrification of ammonium sulphate in samples of soil from different depths from plats 100 and 110, Truekee-Carson Experiment Farm. Original nitrate present in samples from plat 100: Depth, 0 to ti inches, 8 parts per million; (i to 12 inches, 15; 12 to 18 inches, 9; 18 to 24 inches, ; 24 to 36 inches, From plat 110: Depth, 0 to 6 inches, 9 parts per million; 6 to 12 inches, ; 12 to 18 inches, ; 18 to 24 inches, ; 24 to 36 inches, alfalfa field which has been under cultivation for several years. The soil is loose and sandy throughout the 3-foot depth. The nitrate curves show that there is a gradual decrease in nitrifying power with depth. Figures 3 and 4 show the nitrification in samples from ])lats 120 and 130. These are in a fertile alfalfa field similar to the one mentioned '111. 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. Was
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