127 



discarded so as to get comparable weights. The phuits 

 growing in the couniarin treated pots began shedding 

 lirst and h)st k'aves most freely of all the pots in the 

 experiment. On the other hand, the plants following 

 the pyridine and quinolinc treatments made the best 

 early growth of all the pots in the test, these showing 

 a rich dark green color from the beginning. However, 

 there were only slight dilTerences in the appearances 

 of the crops on the various pots at the time that the 

 experiment was terminated, wdth the exception of the 

 coumarin treated plants. Coumarin was apparently 

 injurious to the peas, causing the plants to take on a 

 mottled yellow and green color, and gi'eatly increasing 

 the tendency to shed leaves. 



Table X. Effect of fertilizers, lime, carbon black, 

 coumarin, vanillin, pyrogallol, pyridine, 

 qiiinoline, and dihydroxystearic acid on 

 crop yields in Cullers Field soil. Crops 

 grown in 2-gallon pots in the greenhouse, 

 1914-1915. 



SPECIAL TREATMENT 



" ~ 2 



t. C 1) 



** JK — 



a. rt 



.?S 2 



t- C 4) 



■53 - 



if S 



o 



O !at 



None . 



Cal. carbonate, 9.0 grams 



Couniarin, 9.0 grams 



4.5 ' " 



9.0 " 



4.5 '• 



Vanillin, 9.0 grams 



4.5 " - 



9.0 " 



4.5 " 



Pyrogallol, 9.0 grams 



4.5 '• 



" 9.0 " 



4.5 " 



Carbon black, 9.0 grams . 



Pyridine, 4 5 c. c 



4.5 c. c 



Qiunoline, 4.5 c. c 



4,5 c. c 



Dihydroxstearic acid, 9.0 grams 



K. Sc P. 

 K. & P. 



K. & P. 

 K. & P. 



K. & P. 

 K. i P. 



K. & P. 

 K. & P. 



K. & P. 

 K.'&'P^ 



K. & P. 

 K. & P. 



6.2 

 6.1 

 7.6 

 4.3 

 4.2 

 5.3 

 5.2 

 5.5 

 7.3 

 7.1 

 7.4 

 5.1 

 5.4 

 4.5 

 8.2 

 6.1 

 6.0 

 5.0 

 6.3 

 7 .7 

 5.4 

 5.6 



* "K" means 4.5 grams of kainit; "P' 

 acid phosphate. 



means 4.5 grams of 



