121 



Tabic VII. 



KIJccL of (cililizers, nucleic acid, naphlhij- 

 laininc, asparagine, pyridine and quino- 

 line on crop yields in Cullers Field soil, 

 drops qrown in 2-gallon pots in the green- 

 house' \9\ [-1913. 



SPECIAL TREATMENT 



CO •_— 



>- K '^ 



,s a 



bxj "> 





•-, O 



•T3 O 



Oj i- 



C - 



■^ ? 



CJ o 



III 



^' — 2 



OJ u! 41 



>. u X 



0; •— ; ^ 



rt gj -^ 

 4> "t^ fl^ 



Check — no treatment 



None 



None 



Cal . carbonate, 9 grams 



None 



Nucleic acid, 9 grams 



(' (I Q ii 



Asparagine, 9 grams 



9^" 



N;iptiivlainine, 9 grams 



Pyridine, 9 c. c 



4.5 c. c 



9 c. c 



4.5 c. c 



Quinoline, 9 c. c 



• " 4.5 c. c 



9 c. c 



4.5 c. c 



K. & P. 

 K. & P. 

 K., P. &N 



K. & P. 



K. c^' P. 



K. Sc P. 

 K. c<c P. 



K. & P. 

 K. c^ P. 



1696 

 1117 

 1428 

 1064 

 1650 

 403 

 396 

 1057 



1364 



1303^ 



1092 



' "K" means 4.5 gram.s of kainit; "P" mean.s 4.5 grams of 

 acid phosphate; "N" means 4.5 grams of nitrate of soda. 



Xaphthylamine proved to be of slight benefit to the 

 crop of oats, and moderately helpful to the crop of 

 <?orn following. Apparently it is decomposed very 

 slowly in the soil, and is helpful only when decomposi- 

 tion takes place, 



Asparagine and nucleic acid increased the oat crop 

 to a remarkable degree, when used in connection with 

 potassium and phosphorus; without the minerals, this 

 effectiveness of both is reduced, though the absence 

 of these mineral elements is much more evident with 

 the asparagine treatment than with the nucleic acid 

 treatment. A possible explanation of this ditference 

 between the yields obtained from these substances may 

 be found in the difference in the composition of the 



