The Bulletin, 



33 



slag and 25 pounds of manure salt ; and 65 pounds of dried blood, 

 110 pounds of basic slag and 25 pounds of manure salt. 



IV. Ground Phosphate Rock Tests with .Cotton and Corn. 



PLAN OF EXPERIMENTS. 



These tests (see Tables XVIII and XIX) were planned and 

 put out primarily to test the value of finely ground phosphate rock as 

 a carrier of phosphoric acid to cotton and corn. The tests are to be 

 conducted on the same plats through a number of years in order not 



Fig. 7— Cotton grown at Iredell Farm and fertilized with 75 pounds of Dried Blood, 200 pounds of 



Phosphate Rock and 50 pounds of Manure Salt. 



only to Study its effect upon the first year's crops, but to study its 

 residual effects on these crops planted in subsequent years. The 

 preparation of the land, cultivations, etc., were in. a general way the 

 same as ■ for preceding tests. The fertilizers were applied to the 

 cotton plats on May 2 and to the corn plats on May 9, while the cot- 

 ton was planted May 3 and the corn May 11. 



Tests outside of the general fertilizer tests, with this material, 

 were only conducted at the Iredell farm during the past year, but 

 it is proposed to repeat them at the Edgecombe farm during the com- 

 ing and subsequent years. King's Improved cotton and Weekley's 

 Improved corn were used for planting these tests. 



