110 



yield obtained from the pot treated with nitrate of 

 soda alone. 



Attention is called to the fact that kainit, lime, carbon 

 black, pyrogallol and coumarin were apparently in- 

 jnrioiis to oats, and withont effect on corn. Neither 

 crop was increased bj^ the addition of such corrective 

 agents as corbon black and pyrogallol. The evidence 

 seems to show that this soil is poor because of a specific 

 lack of available plant nutrients, rather than because of 

 the presence of compounds toxic to the crops grown. 



Results of Pot Experiments in Norfolk Sandy Loam 



From College Farm. 



The yields obtained from soil collected from the Ex- 

 periment Station farm are reported in table III. In this 

 test, the plants were grown in 4-gallon pots, each pot 

 containing 40 pounds of the screened soil. A crop of 

 oats was grown during the fall and winter months, and 

 was harvested when the plants were in full head. The 

 pots which had not received phosphate in the treat- 

 ment given the oats were then treated with a full dose 

 of phosphate, i. e., 18 grams. Corn was planted in all 

 pots and allowed to grow until tassels were beginning 

 to show on most plants, when the crop was harvested^ 

 dried and weighed. 



