66 



AGRICULTURAL EXPERIMENT STATION. 



Fertilizers. 



Nothing. 



Dissolved bone black, 37.5 gr 

 Muriate of potash, 37.5 gr . 

 Sulphate of amujonia, 50 gr. 



South Carolina rock, 41. 1 gr. 

 Muriate of potash, 37.5 gr . 

 Sulphate of ammonia, 50 gr. 



Aruba, 31.2 gr 



Muriate of potash, 37.5 gr . 

 Sulphate of ammonia, 50 gr. 



Caribbean Sea guano, 42 gr 

 Muriate of potash, 37.5 gr . 

 Sulphate of ammonia, 50 gr. 



Canadian apatite, 30.7 gr . . 

 Muriate of potash, 37.5 gr . 

 Sulphate of ammonia, 50 gr, 



Vivorella, 33.5 gr 



Muriate of potash, 37.5 gr . 

 Sulphate of ammonia, 50 gr, 



Muriate of potash, 37.6 gr , 

 Sulphate of ammonia, 50 gr. 



163.1 

 154.9 

 169.3 



304.6 

 242.6 

 180.0 



219.1 



196.1 

 213.7 



257.8 

 1.V2.8 

 19J.7 



176.7 



382.2 



* 70,2 



129.5 

 137.1 

 151.5 



250.1 

 212.6 

 152.6 



142.9 

 171.8 



234 

 203 

 260' 



500 



409' 

 300 ! 



302 



350 



289; 



389- 

 339' 

 250 ; 



352 



400 ' 

 377' 



239 



289 

 279' 



385- 

 350' 



287' 



229 

 207 



o a 



"o SO 

 ® Z 



'C eu 



159.1 



242.4 



209.6 



203.4 



209.7 



139.4 





< p. 



232. 



403.0 



313 7 



326.0 



376,3 



269.0 



205.1 340.7 



157.4 



218.0 





391.4 



645.4 



523.3 



529.4 



586.0 



408.4 



545.8 



375.4 



■< C3 O 



bo 



-s !! a 



H .3 5 

 a a 



■S a I 



^ "= a. 



O * =4 



16.0 



270.0 



197.9 



204.0 



210.6 



33.0 



170.4 



*The low yield of grain obtained from box 15 probably results from a loss of grain from 

 shelling. 



This experiment leaves little room to doubt but all of the crude 

 phosphates, except the apatite, caused a large increase in the crop. 

 In the case of the Vivorella there was an increase of 45 per cent, 

 over the boxes whi@h were fertilized with muriate of potash and 

 sulphate of ammonia alone. With the Caribbean Sea guano the 

 increase amounted to 69 per cent. The aruba gave an increase of 

 54 per cent, and the South Carolina rock 52 per cent. 



These experiments in boxes will be continued, and to them will 

 be added pot experiments, in which the only source of phosphoric 

 acid will be the crude phosphates. 



