PRACTICE XI 



PREPARATION OF PLANT-FOOD SOLUTIONS 1 



Solution No. 1. Nitrogen : Dissolve 80 g. of ammonium nitrate in 

 2500 cc. of distilled water. Use 10 cc. per pot. 



Solution No. 2. Phosphorus : Dissolve 25 g. of monocalcium phos- 

 phate or 26 g. of disodium phosphate in 2500 cc. of ammonia-free 

 water. Use 10 cc. per pot. 



Solution No. 3. Potassium : Dissolve 50 g. of potassium sulfate in 

 2500 cc. of ammonia-free water. Use 10 cc. per pot. 



Solution No. 4. Magnesium : Dissolve 20 g. of magnesium sulfate 

 in 2500 cc. of ammonia-free water. Use 10 cc. per pot. 



Solution No. 5. Iron : Dissolve 0.1 g. ferric chlorid in 250 cc. of 

 ammonia-free water. Use 1 cc. per pot. 



Prepare these solutions carefully, using chemically pure salts, and 

 label each bottle. 



1 To be done by the instructor. 



22 



