PLANT FEEDIIVG, 



10 



^eal and kainit will be required for a 7-23/2-23^ ferti- 

 lizer? 



58. How many pounds of acid phosphate, nitrate of 

 soda, dried blood, and sulphate of potash will be required 

 for a 6-2>4-2>4 fertilizer? 



Note. — Since different quantities of materials may be used 

 as carriers, different answers to these problems will result. The 

 principle is an important one, and should be understood and 

 thoroughly mastered. 



Cost of fertilizing materials. The cost of a fertilizer 

 depends upon its constituents. The cost of each element 

 varies from year to year. Unless otherwise indicated in 



Wrs'-^ 



y—4 



' ACID 

 PHOSPHATE 



PHOSPHOROUS, 



Plant Food in Bag of Fertilizer. 



Not all of the bag contents is plant food. Much of it is dirt or material of 



no use to plants. 



the problem take nitrogen as costing 15 cents a pound, 

 phosphoric acid 5 cents, and potash 5 cents. 



59. W'hat is the money value of a ton of fertilizer 

 that analyzes 8 per cent phosphoric acid, 2 per cent nitro- 

 gen, and 2 per cent potash (8-2-2) ? 



Solution : 



2,000 X -OS = 160 160 tb@ 5c = $8.00 



2,000 X .02 = 40 4U tb @ 15c = 6.00 



2,000 X -02 =40 40 tb @ 5c = 2.00 



Total, 



$16.00 



