SOIL AIR 





of lime has been shown by several investigators to increase 

 the carbon dioxide production.^ 



There is now no doubt that biological activities are largely 



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Fig. 47. — Diagram showing the amount of carbon dioxide in air from 

 Volusia silt loam limed and unlimed and cropped to oats. 



responsible for the occurrence of the larg-e quantity of carbon 

 dioxide in the soil air. There are two distinct processes in- 



^Bizzell, J. A., and Lyon, T. L.^ T'he "Effect of Certain Factors on 

 the Carbon Dioxide Content of Soil Air; Amer. Soe. Agron., Vol. 10, 

 No. 3, pp. 97-112; Mar. 1918. 



Potter, R. S., and Snyder, R. S., Carbon Dioxide Prodiiction in Soils 

 and Carbon and Nitrogen Changes in Soi,ls Variously Treated; la. Agr. 

 Exp. Sta., Res. Bui. 39; Feb. 1916. 



Plummer, J. K., Some Effects of Oxygen and Carbon Dioxide on ISfitri- 

 fioation and Ammomfication m Soils; Cornell Agr. Exp. Sta., Bui. 384; 

 Pec, 1916. 



