. Some effects of a harmful organic soil constituent . f r206 +NH3 +K2O, aftergrowth of wheat plants, without dihydroxj-stearic acid—Experiment I. and potassium, expressed as P2O5, NH3, and KjO- The originalconcentration in these elements was in the sum total 80 parts permillion. After analysis, the sum total of the three component partswas again calculated, and the average concentration of these threeelements was ascertained for the eight periods. These average con-centrations will be found in the diagram in figure 5, which gives theconcentration of the solution when no dihydroxystearic acid
. Some effects of a harmful organic soil constituent . f r206 +NH3 +K2O, aftergrowth of wheat plants, without dihydroxj-stearic acid—Experiment I. and potassium, expressed as P2O5, NH3, and KjO- The originalconcentration in these elements was in the sum total 80 parts permillion. After analysis, the sum total of the three component partswas again calculated, and the average concentration of these threeelements was ascertained for the eight periods. These average con-centrations will be found in the diagram in figure 5, which gives theconcentration of the solution when no dihydroxystearic acid was 32 EFFECTS OF A HARMFUL SOIL CONSTITUENT. present, and in figure 6, which gives the concentration of the solu-tion when dihydroxystearic acid was present. It will be seen thatin practically all cases where dihydroxystearic acid was present theconcentration of the solution was not reduced as much as in thecorresponding solution without dihydroxystearic acid. A moredetailed discussion of these results and their component parts willbe given K9O Fig. 6.—Showing the average concentration of the solution, in parts pei milhon of P2OD +NH3 +K2O, aftergrowth of wheat plants, with dihydroxystearic acid—Experiment I. RATIOS OF P2O5, NHg, AND KjO FOUND IN THE VARIOUS CULTURESOLUTIONS OF EXPERIMENT I. Table II gives the ratios of P2O5, NHg, and K2O found in thevarious culture solutions of Experiment I. In the second columnare given the original ratios; in the third and fifth, the averageratios found by analj^sis to exist in the solutions during the eightperiods, without and with dihydroxystearic acid, respectively; thefourth and sixth columns give the ratios of the removed material,respectively. il. 70, Bureau of Soils, U. S. Dept. of Agriculture, Plate II.
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