REMOVAL OF NUTRIENTS FROM THE SOIL 307 



163. Quantities of nutrients removed by drainage and 

 cropping. — Now that an adequate conception has -been pre- 

 sented regarding the composition of soil drainage water and 

 also of the nutrients removed by cropping, it is interesting to 

 note what the combined result may be on the same soil. Such 

 information can be obtained only in a few instances. The 

 following data from the lysimeters at the Cornell Experiment 

 Station ^ are valuable in this respect.^ The soil used was a 

 Dunkirk silty clay loam. 



Table LXVIII ' 



AVEEAGE ANNUAL LOSS OF NUTRIENTS BY PERCOLATION AND 



CROPPING. CORNELL LYSIMETER TANKS. 



AVERAGE OF 10 YEARS. 



Condition 



Pounds to the Acbb pee Tear 





N 



PA 



K,0 



CaO 



SO, 



Drainage losses 



Bare 



Rotation .... 



Grass 



Crop removal 



Bare 



Rotation .... 



Grass 



Total loss 



Bare 



Rotation .... 



Grass 



69.0 

 7.3 

 2.5 



70.5 

 54.4 



69.0 

 77.8 

 56.9 



43.5 

 28.6 



43.5 

 28.6 



86.4 

 68.7 

 74.0 



105.4 

 74.0 



86.4 

 174.1 

 158.0 



557.0 

 345.9 

 363.8 



24.3 

 12.8 



557.0 

 370.2 

 376.6 



132.0 



108.5 

 111.0 



41.0 

 29.2 



132.0 

 149.5 

 140.2 



=^ Unpublished data, Cornell Agr. Exp. Sta., Ithaca, N. Y. 



^A study was made at the New Jersey Bxperiment Station of the 

 nitrogen losses from a loam soil in cylinders under a five-year rotation 

 of corn, oats, wheat and timothy for 20 years, treated in various ways 

 as to lime, manure and fertilizers. The average loss of nitrogen from 

 the surface ten inches of soil for 15 years was 103 pounds annually 

 due to cropping and leaching, bata were obtained by analyzing the 

 soil and the crops, Lipman, J. G., and Blair, A. W., Nitrogen Under 

 Intensive Cropping; Soil Sci., Vol. XII, No. 1, pp. 1-16, July, 1921. 



