32 



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, 

 Muriate of potash, H7.5 

 Sulphate of ammonia, 50 grs 



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 ol putash, 37,5 gr. 

 Sulphate ot ammoniii, 50 gr 



Vivorella, 33.5 gr 



Muriate of potash, 37.5 gr. 

 Sulphate of ammonia, 5li gr 



Muriate of potash, 37.5 gr. . ? I 5 ^5 

 Sulphate of ammonia, 30 gr S ' f 26 



203.4 



209.7 



139.4 



205.1 



157.4 



EC 



= s 



o to 

 '?> = 



o ■" 

 be !«! 

 « => 





— a. 



?.& 



= S 



— Cfi (B 



232.3 



403.0 



313.7 



326.0 



376.3 



269.0 



I I o 



s-Z a 

 = 5 o 



bo, 





X a I 



- * -w -^ 





*! - O 



.O o 



< A iSI< o -^ I- cut 



391.4 



645 4 



523.3 



529.4 



586.0 



408.4 



340.7 545.8 





218.0 



375.4 



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 irom a loss of grain from 

 ehelling. 



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

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

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

 over the boxes which were fertilized with muriate of potash and 

 sulphate of ammonia alone. AV'ith the Caribbean Sea guano the 

 increase amounted to 59 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. 



