IM.ATE V, 



NO TREATMENT 



7 9 



COUMA.RIN 9 GRAMS COUMARIN 9 GRAMS 

 COUMARIN g GRAMS KAINITE 4 S KAINITE 4S 



PHOSPHATE 4 S 



PHOSPHATE 4 S 

 NITPATE 4 S 



Fig. 1. Iiiiinediate effect of coumarin on oats when applied 

 alone and in connection with fertilizers. 



CHECK 

 NO fbEATMENT 



38 

 TO PREVIOUS CROP 

 KAINITE * S GPAMS 

 PHOSPHATE 4 6 

 NfTRATC 4 S 



TO CORN - KPt N 



TO PREVIOUS CROP- 

 C01;MARIN 9 GRAMS 



KAINITE 4 S 



PHOSPHATE 4 S 



NITRATE 4 S 



TO CORN-K PS N 



TO PREVIOUS CROP- 

 C0UM6RIN 4 S GRAMS 

 KAINITE 4 S GRAMS 

 PHOSPHATE 4 S 



TO CORN-K P&N 



Fij,'. 2. iiesitliiai effect on corn of c(nunarin applieil lo the 

 previous crop of oats. 



