Tub Bulletin. 



35 



received double (iiiantity of uitrogen from dried blood, wliich material 

 contains this constituent in a rather readily available form, hence a 

 tendency was produced to a prolonged vigorous growth of the cotton ; 

 this tendency was also accentuated by the type of soil on which these 

 experiments were conducted. 



Tabll XIX— results OF TESTS WITH GROUND PHOSPHATE ROCK 



ON CORN IN 1906. 



Iredell Farm. 



w 

 E 



9 



Fertilizer Application per Acre. 



( 65 pounds dried blood 



<. 150 pounds ground phosphate rock - 

 ( 25 pounds manure salt 



i 2,000 pounds stable manure 



' 170 pounds ground phosphate rock- 



o 



fa 



NPoK 



NP2K 



130 pounds dried blood 1 



150 pounds ground phosphate rock V (NP)2K 



25 pounds manure salt ) 



f 4,000 pounds stable manure \\ /^pv tt- 



\ 350 pounds ground phosphate rock— J j '•■Nr^sK 



( 65 pounds dried blood 1 I 



<. 300 pounds ground phosphate rock 



( 25 pounds manure salt 



NP4K 



f 2,000 pounds stable manure 1 „p „ 



( 170 pounds ground phosphate i J^^^"- 





"S 4; 



CO tj 



— ft 

 3b 



16.8 

 17.2 

 23.4 

 22.0 

 20.2 

 18.0 



P 

 O 



c 



O . 



o to 



n 



14.04 

 13.20 

 12.12 

 10.80 



fa V 

 S ^^ 



O 0) 



Oft 



$10.08 $ 2.95 



10.32 2.85 



I 



4.90 



4.75 



3.70 



2.85 





° o 

 at > 



>o 



$ 7.13 

 7.47 

 9.14 

 8.45 

 8.42 

 7.95 



RESULTS OF PHOSPHATE EOCK TESTS WITH CORN. 



In these tests the plat producing the most favorable showing was 

 the one receiving an application of 130 pounds of dried blood, 150 

 -pounds of finely ground phosphate rock and 25 pounds of manure 

 salt per acre applied in the drill just before planting. As there are 

 not at this stage of the experiments any striking differences in the re- 

 sults from the different applications on corn, further discussion of 

 them will be reserved until more data are at hand. 



