124 



l\ih.le VIIL 



E/Ject of ferlili-ers, lime, and dilii/droxij- 

 stearic acid on crop yields in Cullers 

 Field soil. Crops grown in 2-gallon pots 

 in the greenhouse, 1914-1915. 



5PECIAL TREATMENT 



a; 



'a. 



S D 





o 

 o 



Check — no treatment 



None 



None 



Cal. carbonate, 9 grams 



None 



Cal. carbonate, 9 grams 



Dihydroxstearic acid, 9 grams. 

 •' 9 " - 



Cal. carbonate. 9 grams 



K- 



K. & P. 

 K. .Sc P. 

 K.,P. c^ N 

 K. , P. c^ N 



K. 



K. &: P. 



K. , P. ;;c N 

 K.. P.c^N 



lOO'-i^. 



1696 



2052 



100 



103 



1928 



' "K" means 4.5 grams of kainil; "P" means 4.5 grams of 

 acid j)hosphate; "N" means 4.5 grams of nitrate of soda. 



Prol)aljly the most interesting of all of our experi- 

 ments is riported in Table IX. The three pots used 

 contained the same soil that was used in the experi- 

 inients of 1913-1914. The check pot had been a check 

 pot in an experiment conducted the previous year; 

 the second pot on the table received nine grams each of 

 acid })hosphate and kainit the previous year; and the 

 tliird pot had received 18 grams of pyridine. Based on 

 the 40 pounds of air diy soil per pot, the eighteen gram 

 doses are ccjuiNalent to 1000 parts per million, and the 

 nine gram doses, to 500 parts per million of dry soil. 

 Since none of llie toxins a])plied singly had killed either 

 oats or c(nii, and jnridine and quinoline had been help- 

 ful, when applied singly, it was thought possible that a 

 combination of all the toxic compounds at hand might 

 prevent growth entirely. Further, these few pots were 

 used in this way in the hope of getting an msight into 

 the action of such combinations, so, as to have a basis 

 for some future work. 



In considering the data obtained, it should be remem- 

 b( red that the last pot in the table had had a hea^y 



