214 



SOILS AND FERTILIZERS 



POTASH PER ACRE 

 K 2 

 LBS. 



Corn, 65 bu 15 



Stalks, 3000 Ibs 45 



Total 6 



Peas, 30 bu . . 



Straw, 3500 Ibs 3^ 



Total 6 



Flax, 15 bu '. . 



Straw, 1800 Ibs 19 



Total 27 



Mangels, 10 tons 150 



Meadow hay, i ton 45 



Clover hay, 2 tons 66 



Potatoes, 150 bushels 75 



245. Amount of Potash in Soils. Ordinarily there 

 is in soils from o. i to 0.5 per cent of potash, equivalent to 

 from 3500 to 18,000 pounds per acre to the depth of 

 one foot. Many soils with apparently a good stock of 

 total potash give excellent results when a light dressing 

 of potash salts is applied. The amount of available 

 potash in a soil is more difficult to estimate than the 

 available phosphoric acid. There is much difference in 

 crops as to their power of obtaining potash ; some re- 

 quire greater help in procuring it than others. A lack 



