. The nature and properties of soils; a college text of edaphology. Soils. 544 NATUEE AND PROPEKTIES OF SOILS Not only do the products of the first stage of decay influ- ence the crop growing on the soil, but they affect the biological activities as welL^ Nitrification in particular seems to be in- fluenced, as nitrates do not begin to appear until the process of humifieation is well advanced. Nitrification, however, is probably not entirely suppressed as it is possible for soil or- ganisms to use up the nitrates as rapidly as they are TIME AFTER APPLICATION Pig. 64.—^Diagram iUustrat
. The nature and properties of soils; a college text of edaphology. Soils. 544 NATUEE AND PROPEKTIES OF SOILS Not only do the products of the first stage of decay influ- ence the crop growing on the soil, but they affect the biological activities as welL^ Nitrification in particular seems to be in- fluenced, as nitrates do not begin to appear until the process of humifieation is well advanced. Nitrification, however, is probably not entirely suppressed as it is possible for soil or- ganisms to use up the nitrates as rapidly as they are TIME AFTER APPLICATION Pig. 64.—^Diagram iUustrating the" three stages in tlie decay of a green-manure. I, humus production dominant; II, a balance be- tween humus production and destruction j III, humus destruction dominant. A depression in nitrate accumulation generally occurs in stage I followed by an increase. (After Martin.) As the humus destruction gradually dominates over humus production, the end products of the decay become prominent. The complex proteid decomposition is practically completed and cellulose destruction is slowly progressing. Of the sim- ple nutritive products, the nitrates are of particular impor- tance. In fact, they have been chosen by a number of in- =^ Briscoe, C. F., and Harned, H. H., Bacterial Effects of Green Manures; Miss, Agr. Exp. Sta., Bui. 168, Jan. 1915. Hutchinson, H. B., The Influence of IPlant Besidues on Nitrification and on Losses of Nitrates in Soil; Jour. Agr. Sci, Vol. IX. Part 1, pp. 92-111, Aug. 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 Lyon, T. L. (Thomas Lyttleton), 1869-1938; Buckman, Harry Oliver, 1883-. New York, Macmillan
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