156 LESSONS IN AGRICULTURE 



Acid phosphate, $12.50 per ton. 



Muriate of potash, $42.00 per ton. 



How much would a pound of each cost? 



When a farmer speaks of a fertilizer as being 2 :8 :10, 

 he means that it contains 2% nitrogen, 8% phosphoric 

 acid, and 10% potash. 



How would 2000 pounds of fertilizer of this type be 

 made up? 



NOTE. Assume in the above problem that nitrate of 

 soda contains 15% nitrogen, the acid phosphate 14% 

 phosphorus, and the muriate of potash 50% potash, de- 

 termine how much of these commercial fertilizers would 

 be required to furnish the essential amount of pure 

 elements. 



12. At the College of Agriculture, Cornell Univer- 

 sity, two tons of manure that had been weighed and 

 analyzed were left exposed from April 25 to September 

 22, with the following results: 



April 25. Sept. 22. 



Total weight 4,000 Ibs. 1,730 Ibs. 



Nitrogen 19.6 Ibs. 7.72 Ibs. 



Phosphoric acid 14.8 Ibs. 7.79 Ibs. 



Potash 36. Ibs. 8.65 Ibs. 



What was the value of the nitrogen, phosphoric acid, 

 and potash in this manure on April 25, and on Sep- 

 tember 22? (Use the values given above). How much 

 was lost? 



There are two ways to prevent such losses the ma- 

 nure may be hauled and spread on the land every 

 few days, or it may be kept in covered sheds. 



13. A good fertilizer for timothy hay has been found 

 to be one containing 200 pounds of nitrate of soda, 100 



