Ill 



Tabic III. E/fect of fertilizers, lime, carbon black\ 

 pyrogallol, and pyridine on crop yields in 

 College Farm soil. Crops grown in 4-gal- 

 lon pots in the greenhouse, 1913-1914. 



KIND OF TREATMENT 



c 



3 rt 

 o t 



U; rt 'J 



£ o ^ 



Check, no treatment 



Nitrate of Soda 



Acid Phosphate 



Kainit 



Nitrate, Phosphate, Kainit, each 



Calcium Carbonate 



Carbon Black 



Pyrogallol 



Pyrogallol 



Pyrogallol 



Pyrogallol 



Pyridine 



Pyridine 



Pyridine 



Pyridine 



18.0 



18.0 



18.0 



18.0 



18.0 



18.0 



18.0 



9.0 



4.5 



1.8 



18.0 



9.0 



4.5 



1.9 



30.7 



191.0 



156.5 



27.1 



120.0 



38.9 



41.0 



19.7 



31.8 



48.5 



49.0 



138.9 



141.8 



106.0 



52.7 



c 

 o 



-J -C C/i 



S O 



19.1 

 16.9 

 15.6 

 24.6 

 19.4 

 21.1 

 16.9 

 19.1 

 16.8 

 18.6 

 19.3 

 19.3 

 14.2 

 20.2 

 19.5 



I -a" 



'■J i^ C 



49.8 



207.9 



172.1 



81.7 



139.4 



60.0 



57.9 



38.8 



48.6 



67.1 



68.3 



158.2 



156.0 



126.2 



72.2 



>. V - 

 . Si O 



ion 

 418 

 345 

 164 

 280 

 120 

 116 

 78 

 99 

 134 

 136 

 317 

 313 

 255 

 145 



Nitrogen and phosphorus were both very effective on 

 the oat crop, while kainit and lime were only slightly 

 beneficial. For some unaccountable reason, the plants 

 on the pot with complete fertilizer made a poor growth 

 from the beginning, and it is possible that some error 

 was made in applying the treatments, but no source of 

 error could be discovered. In two cases, light applica- 

 tions of pyrogallol appeared to have slightly benefitted 

 the oats, but there was no corresponding benefit to 

 corn; and it is doubtful whether this slight increase in 

 the oat crop is due to any action of the pyrogallol. It is 

 probable that small differences are due to slight in- 

 equalities in the fertility of the potted soil, rather than 

 to any helpful action of the material added. 



A most interesting result of the work with this soil 

 is that pyridine is nearly as effective in increasing the 

 oat crop as is nitrate of soda. Reference to the last 

 column of the table shows at a glance that this com- 

 pound very greatly increased the crop, rather than 

 causing any injury, as would have been expected from 

 water cultures. 



