. International Review of the Science and Practice of Agriculture. rst in the formation of ammonia in the solutions containing peptones,an increase on the formation of the ammonia taking place only when thesoil was completely saturated with moisture. It would seem therefore thatthe formation of ammonia may be attributed to the anaerobic bacteriawhich must predominate in such a soil. The influence of the proportion of moisture in the soil was clearly evi-dent in the solutions containing gelatine. The direct determination of theammonia when the peptones were added to the soil itself and not only
. International Review of the Science and Practice of Agriculture. rst in the formation of ammonia in the solutions containing peptones,an increase on the formation of the ammonia taking place only when thesoil was completely saturated with moisture. It would seem therefore thatthe formation of ammonia may be attributed to the anaerobic bacteriawhich must predominate in such a soil. The influence of the proportion of moisture in the soil was clearly evi-dent in the solutions containing gelatine. The direct determination of theammonia when the peptones were added to the soil itself and not only tothe nutritive solutions containing known quantities of soil, gave analogousresults. When sugar was added, the accumulation of ammonia was no longerobserved, even if the soil was saturated with moisture. The other series of experiments, made with the same samples of soil,gave the following quantities of nitrites, expressed as N02 for each millionparts of the damp soil: Percentage of maximum moisture saturation in the soil 20 °/0 40 » . 60 » 80 » . IOO ». By way of compensation, the quantities of nitric nitrogen were: Percentage of max. moisturesaturation of the soil In 1 million parts of soil Septemb. 231907 June 261908 July 7 1908 Aug. 31908 October 231908 20 70 40 » 60 » 80 » IOO » o-3 19-3tracestraces ,2tracestraces These data seem to show that the average saturation of the absorbantpower of the soil for water, when the moisture contained in the soil isfrom 20% to 6o°/0 of the maximum of saturation, constitutes the optimumfor soil-nitrification. SOIL: MOISTURE. - EVAPORATION 279 C. v. Seelhorst. Effect of Shade on the Evaporation from the Soil. (Uebeiden Einfluss der Beschhattung auf die Wasserverdunstung des Bodens).—Journal fur Landwirtschaft, LVIII-B., H., Ill, pp. 221-228. Berlin, 1910. These experiments were made with rye, in a clay soil placed in boxes. Erom April 1
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