250 



Journal of Agricultural Research 



Vol. xrx. No. 6 



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Fig. I— Diagrams showing relation of the water-soluble acidity to the water-soluble potassium at different 

 time periods for different greensand composts. The open columns indicate the number of cubic centi- 

 meters of Nlio sodium hydroxid required to neutralize lo gm. of compost on moisture-free basis, and the 

 solid colimins indicate the number of milligrams of water-soluble potassium obtained from lo gm. of 

 compost on moisture-free basis. 



