HOINIK MIXTUKI 



l.HJ 



nitrate and nitrogen in some desirable organic form to help pro- 

 duce a crop. Again, a farmer may be growing cotton, corn, 

 sugar-cane, etc., on a soil that is very rich in available potash. 



Fig. II.— Corn is a crop that thrives on farm manure. 



It would certainly be a waste of money for him to purchase a 

 fertilizer containing potash. 



