500 SOILS: PROPERTIES AND MANAGEMENT 



nitrates and leached from the soil in sufficient quantities to 

 entail a very decided loss of nitrogen. There is not likely 

 to be so large a loss of nitrogen from ammonium salts as 

 from nitrates, and, as would naturally be expected, there is 

 greater loss of nitrogen when these salts are used alone than 

 when they are combined with other fertilizing ingredients. 

 Hall 1 has estimated the loss of nitrogen from certain 

 drained plats at the Rothamsted Experiment Station. 

 This estimate is based on the concentration of the drain- 

 age from the different plats, of which there was no record 

 of total flow, but for which the measurements of flow from 

 the lysimeter draining 60 inches of soil were taken and the 

 total loss of nitrates was calculated on this basis. Esti- 

 mated in this way the effects of several different methods 

 of manuring are shown in the accompanying table : 



POUNDS TO THE ACRE OF NITRIC NITROGEN IN DRAINAGE WATER 



1 Hall, A. D. The Book of the Rothamsted Experiments, 

 p. 235. New York, 1905. 



