that which had been cropped. The excess ran in many cases from 

 I 5 to 300 tons per acre. 



The importance of sub-surface packing soils in semi-arid 

 districts has been greatly emphasized in recent years. To determine 

 the actual effect of this process, the Chemical Division carried out 

 a series of tests with soils taken from packed and unpacked areas 



Root of two-year old clover plant. (Note the nodules wherein 

 reside the nitrogen fixing bacteria. 



at Lethbridge, Alta. The reported results indicate a slight advantage 

 from the use of the packer. 



FACTORS CONDUCIVE TO SOIL FERTILITY. 



In the course of a long series of investigations with soils covering 

 both chemical and physical determinations, results were obtained 

 which made it possible to draw certain conclusions regarding what 

 328805! 



