16 



has been shown that it is not necessary for added sulfate of am- 

 monia to be nitrified to cause an increase in the amount of 

 this element in solution. Soil extracts which are toxic be- 

 cause of soluble manganese have been made productive by the 

 additions of either calcium, sodium, or potassium hydroxides. 

 For the growth of garden peas, the addition of pure calcium 

 carbonate to such extracts markedly reduces the toxicity. The 

 addition of lime to an acid soil prevents completely the solu- 

 tion of manganese. 



A manuscript relative to manganese for publication is near- 

 ing completion. 



Respectfully submitted, 



J. F. DUGGAR, 

 Director and Agriculturist- 



