PLANT FEEDING. 35 



of brands of commercial fertilizers. The average cost 

 of each is, for nitrogen 15 to 20 cents a pound, for phos- 

 phoric acid 5 cents a pound, and for potash 4 cents a 

 pound. The cost of nitrogen is steadily rising. But let 

 us assume it to be 20 cents a pound. The latest tests of 

 the agricultural college experiment stations show that 



TWO CROPS AT THE SAME TlME. 



Corn and cowpeas are here growing. The cowpeas were plowed under after 

 the corn was harvested, to add nitrogen and vegetable matter to the soil. 



nitrogen is today costing the farmers close to 20 cents a 

 pound when bought in fertilizers. Where mixed farm- 

 ing is practiced the corn stalks can all be used for fodder 

 and for bedding. The stover from an acre of corn is 

 worth almost as much as the hay from an acre of timothy 

 or clover. 



QUESTIONS. 

 1. What is the value of the corn raised on your farm 



