CHEMICAL ANALYSIS OF SOILS 



325 



m . _,_ _ T •V'"VTTT 



THE PERCENTAGES OF NITROGEN AND CALCIUM IN THE DUNKIRK 



SILTY CLAY LOAM AND THE VOLUSIA SILT LOAM AND THE 



NITROGEN REMOVED BY CERTAIN CROPS. CORNELL 



LYSIMETER TANKS. 



Soils 



CaO 



% 



N 

 % 



Pounds op N Eemoved 



PER ACKE 





MAIZE 



1915 



OATS 



1916 



BARLEY 

 1917 



Dunkirk silty clay loam. . . 

 First foot 



.340 



.280 



.490 



1.530 



.230 

 .165 

 .260 

 .365 



.134 

 .062 

 .064 

 .054 



.145 



.052 

 .059 

 .050 



53.6 



28.3 



62.3 

 21.7 



44.0 



Second foot 





Third foot 





Fourth foot 





Volusia silt loam 



18.8 



First foot 





Second foot 





Third foot 





Fourth foot 









and in a general way there is often some correlation between 

 the amount of calcium present and the productivity. In 

 humid regions soils high in lime are usually fertile. Within 

 certain limits, therefore, calcium becomes significant in fer- 

 tility studies.^ 



Some idea concerning the relative value of the various chem- 

 ical methods, especially those dealing with potash, lime, phos- 

 phoric acid, and magnesia, may perhaps be obtained by com- 

 paring actual data. Burd ^ has analyzed a number of soils, 



^Shedd, 0. M., A Proposed Method for the EsiiTmtion of Total 

 Calcium in Soils and the Significance of this Element in Sod Eertility; 

 Soil Sci., Vol. X, No. 1, pp. 1-14, 1920. 



*Burd, J. S., Chemical Criteria, Crop Production and Physical Classi- 

 fication m Two Soil Classes; Soil Sei.j Vol. V, No. 6, pp. 405-419, 1918. 



