A GOOD SOIL 



AVERAGE OF CALIFORNIA SOILS 



1.5 



1.5 1.5 



SULPt 



SULPH.ACID MA6Nf5IA 



ORGANIC 

 MATTER 



CHART NO. 1 

 Figures on California soils taken from Hilgard's Book on Soils, and 

 from R. R. Snowden. Figures on elements necessary in an excellent 

 soil taken from the average of many authorities in both United States 

 and Europe. 



120 



