86 



The Bulletin 



TABLE IX.— Continued. 

 EFFECT OF VARYING QUANTITIES OP POTASH. 



1 Detailed results are given in September, 1910, Bulletin of North Carolina State Department of M 

 Agriculture. f 



2 In 1908 a 2}^ (NPK) application of Fertilizer was made instead of a 3 (NPK) one as indicated 



Nitrogen and Potash N K (Plats 6, 8^ and 5), There were small 

 average increased yields of corn in the three fields from applications 

 of nitrogen and potash combined, the average for the seven years in 

 the three fields being 1.5 bushels per acre, which was not sufficient to 

 pay for the fertilizer. This fertilization w^as therefore at a loss, hav- 

 ing cost 3o cents per acre more annually than the value of the increased 

 yield of corn and stover. 



PhosT^horic Acid and Potash, P K (Plats 7, 92 and 12-). Phosphoric 

 acid and potash combined gave increased yields on all the plats in the 



