GARDEN YARD ^56 



or, in other words, 20 pounds. For example, if 

 kainit contains 12 per cent, of potash and is 

 sold at $12.00 per ton, then there are 12 units 

 and they cost $12.00; therefore one unit costs 

 $1.00, and since the unit is 20 pounds, the actual 

 cost of the potash is 5 cents per pound. If 

 muriate of potash, guaranteed to contain the 

 equivalent of 50 per cent, of potash, is selKng 

 at $40.00 a ton, then we find that 50 per cent, 

 potash is 50 units; if 50 units cost $40.00, one 

 unit will cost 80 cents, or in this form 20 pounds 

 cost 80 cents; therefore one pound will cost 

 4 cents. 



Now, if these are prices free on board the cars 

 at New York, and potash is the thing we need, 

 we must remember that in order to get equal 

 amounts of potash delivered to our own farm, 

 we must pay freight and haul four tons of 

 kainit instead of one ton of muriate of potash. 

 In other words, with these figures the higher- 

 priced fertilizer, counting in dollars per ton, is 

 really the cheaper article, counting in value. 



Any one who will secure the latest fertihzer 

 bulletin from the nearest Experiment Station 

 will usually find the approximate values of one 

 pound of nitrogen, phosphoric acid and potash 

 in the different fertilizers worked out in some 

 part of the bulletin. These may be used in 



