178 SOILS AND FERTILIZERS 



grain crops from 35 to 60 pounds of potash per acre 

 are removed from the soil. For grass crops more pot- 

 ash is required than for grains, while roots and tubers 

 require more than grass. The approximate amount 

 of potash removed in various crops is given in the 

 following table : 38 



Potash per acre 

 tt>s. 



Wheat, 20 bu 7 



Straw, 2,000 Ibs 28 



Total 35 



Barley, 40 bu 8 



Straw, 3,000 Ibs 30 



Total 38 



Oats, 50 bu 10 



Straw, 3,000 Ibs 35 



Total 45 



Corn, 65 bu 15 



Stalks, 3,000 Ibs 45 



Total 60 



Peas, 30 bu 22 



Straw, 3,500 Ibs 3 8 



Total 60 



Flax, 15 bu 8 



Straw, i, 800 Ibs 19 



Total 27 



Mangels, 10 tons 15 



Meadow hay, i ton 45 



Clover hay, 2 tons 66 



Potatoes, 150 bushels 75 



