FERTILITY AND HOW TO MAINTAIN 71 



"Soils and Soil Fertility." Whitson and Walston. 



"The Fertility of the Land." Roberts. 



Kentucky Agricultural Expt. Station Bulletin 191. "Teachings of Kentucky Agricultural 



Expt. Station Relative to Soil Fertility." 

 Farmers' Bulletins, U. S. Dept. of Agriculture: 



342. "Conservation of Soil Resources." 



406. "Soil Conservation." 



421. "The Control of Blowing Soils." 



446. "The Choice of Crops for Alkali Land." 



