New York Agricultural Experiment Station. 403 



illustrations of plant-food mixtures. 

 For illustration we will give a few examples, showing how we 

 can prepare different mixtures by using the same materials in 

 varying quantities. 



Mixture No. i. 



250 pounds nitrate of soda, containing 37.5 pounds of nitrogen, 



200 pounds cottonseed-meal, containing 12.5 pounds of nitro- 

 gen, 

 1,300 pounds acid phosphate, containing 180 pounds of available 

 phosphoric acid, 



120 pounds muriate of potash, containing 60 pounds of potash, 



130 pounds land plaster or other inert material. 

 This gives us a mixture containing in one ton about 50 pounds 

 of nitrogen, 180 pounds of available phosphoric acid and 60 

 pounds of potash or, on the basis of 100 pounds, 2.5 per ct. of 

 nitrogen, 9 per ct. of available phosphoric acid and 3 per ct. of 

 potash. In this mixture, we have relatively small amounts of 

 nitrogen and potash in relation to phosphoric acid. The cotton- 

 seed-meal, besides furnishing some plant-food, enables us to make 

 a mixture of good mechanical properties that behaves well in a 

 drill. 



Mixture No. 2. 



300 pounds nitrate of soda, 



300 pounds cottonseed-meal, 



500 pounds bone-meal, 



500 pounds acid phosphate, 



400 pounds muriate of potash; 

 or, using only acid phosphate, we may have the following: 



400 pounds nitrate of soda, 



300 pounds cottonseed-meal, 



900 pounds acid phosphate, 



400 pounds muriate of potash. 



In this mixture, we have about 4 per ct. of nitrogen, 6 per ct. 

 of available phosphoric acid and 10 per ct. of potash, in which 

 the potash is high relative to the other constituents. It will be 

 seen that this mixture differs from the first in being of higher 

 grade, particularly in respect to nitrogen and potash. The use 

 of bone in place of part of the acid phosphate, as indicated in one 



