150 ELEMENTS OF AGRICULTURE 



INCREASED YIELDS DUE TO MANURE AND FERTILIZER 



If corn is worth 40 cents per bushel, wheat 70 cents, hay $8 per 

 ton, stover $3, and straw $2, fill out the following table: 



VALUE OF INCREASE DUE TO MANURE AND FERTILIZER. 



PROBLEMS FOR CLASSES THAT HAVE STUDIED CHEMISTRY 



13. Write the reactions when : (1) Limestone is burned; (2) quick- 

 lime is water-slaked; (3) plaster dries out; (4) when quicklime air-slakes. 



14. Find the comparative amounts of lime (CaO) in limestone, 

 quick-lime and water-slaked lime. 



'Cost of the acid phosphate and floats per acre 



