19.23] 



Soil Treatments of Toxic Material 



45 



Kainit and acid phosphate 21% 



Kainit, acid phosphate and limestone 44% 



Acid phosphate (320 lbs. per A) — loss 20% 



Acid phospliate and limestone — loss 6% 



The outstanding features of this tabulation are the depressing 

 effect of acid phosphate, except where used with kainit alone and the 

 stimulating effect of kainit wherever used. Nitrate of soda has given 

 remarkable results alone and has added, in every case, to the bene- 

 ficial result from kainit but has not overcome the depressing effect of 

 acid phosphate. Kainit alone has overcome this depressing effect in 

 every combination. Limestone has given stimulative effects in every 

 combination except with nitrate of soda. 



Tabulating these effects, we get the following : 



Table II. Per Cent Increase Due to Fertilizer at Top of Column When 

 Added to Soil With Compound or Combination of Compounds at Side 



Kainit 



Limestone 



Nitrate of 

 Soda 



Acid 

 Phosphate 



*N — Nitrate of soda, 160 lbs. per A. 

 P — Acid phosphate, 320 lbs. per A. 

 K— Kainit, 480 lbs. per A. 

 L — Limestone, 1-4 tons per A. 



Let us now note the relation between the effects of these treatments 

 on yield and their effects on discoloration of the nodal tissues of the 



