PLANT FEEDING. 15 



We now have 



Phosphoric acid Nitrogen Potash 



In acid phosphate 168 00 



In cottonseed meal 10 28 6 



In kainit 00 00 50 



178 28 56 



42. In a ton of fertilizer mixed in this way what is the 

 percentage of each element of plant food? 



Solution : To find this percentage divide the amount of each 

 element by the total amount of the mixtuie, and multiply by 100. 

 The calculation is as follows : 



Phosphoric acid, 178 -4- 2,000 X 100 = 8.9% phosphoric acid 



Nitrogen, 28 -j- 2,000 X 100 = 1.4% nitrogen 



Potash, 56 ^- 2,000 X 100 = 2.8% potash. 



Note. This mixture would be designated as a 8.9-1.4-2.8 

 mixture. 



43. How many pounds of nitrogen, phosphoric acid 

 and potash in a ton of fertilizer, containing 1,400 pounds 

 of acid phosphate, 100 pounds of nitrate of soda, 200 

 pounds of cottonseed meal, 100 pounds of dried blood, 

 and 200 pounds of muriate of potash ? 



44. What is the percentage of phosphoric acid, nitro- 

 gen and potash in the above fertilizer? 



45. Suppose, instead of using 1,400 pounds of acid 

 phosphate, we use 1,400 pounds of ground bone; how 

 many pounds of nitrogen, phosphoric acid, and potash 

 will the ton of mixture contain? 



46. What is the percentage of phosphoric acid, nitro- 

 gen and potash in a ton of the mixture? 



Fertilizer formulae: 



A Widely Used Corn Fertiliser. 

 Acid phosphate, 875 pounds 



Cottonseed meal, 950 pounds 



Kainit, 175 pounds 



Total, 3,000 pounds 



