124 Vniversity of California Publications in Agricultural Sciences [Vol. 1 



The average differeuce shows .28 per cent, an amount which 

 is too small to be a matter of consideration for practical im- 

 provement in the quality of the grain. Further, it Avill be noted 

 that such differences as do occur did not run always in the same 

 direction. 



THE EFFECT OF PHOSPHATES 



In the.se trials the superphosphate used was from treated 

 rock and the amounts used are given in the scheme previously 

 shown. 



In general, the phosj:)hates as here shown appear to have had 

 a slight tendency toward increasing the total protein, but ,it is 

 very slight on the average. In five cases out of seven, however, 

 the phosphate plats carried somewhat higher protein than did 

 the check plats. A more extended study, however, will be re- 

 quired before any definite conclusion can be reached. 



THE EFFECT OF POTASH 



In these trials the potash was universally' used in the form 

 of sulfate in the amounts indicated in the general tabulation. 



