CONSERVATION OF FERTILITY 253 



Food and Fuel Purchased 



Phosphoric 



Nitrogen. acid. Potash. 



Pounds. Pounds. Pounds. 



Bran, 5 tons 275 260 150 



Shorts, 5 tons 250 150 100 



Oil meal, 2 tons 100 35 25 



Hard-wood ashes 25 100 



625 470 375 



Sold from farm 1278 676 380 



Loss in food consumed, etc . . . 128 53 144 



Total 1406 729 524 



Food and fuel purchased 625 470 375 



Balance lost from farm 781 259 149 



The manure produced and used on this farm results 

 in the production of larger crop yields than is the 

 case with exclusive grain culture. The clover and 

 peas more than balance the loss of nitrogen. Ex- 

 periments have shown that a rotation similar to 

 this caused an increase in soil nitrogen. Manure, 

 meadow and pasture all tend to increase the soil 

 humus and nitrogen. The losses of phosphoric acid 

 and potash are exceedingly small, averaging less 

 than a pound per acre of each. The action of manure 

 on this farm is continually bringing into activity the 

 inert plant food of the soil so that every year there is 

 a larger amount of active plant food, which results in 

 producing larger yields per acre. 



The increase or decrease of fertility on farms has 

 a marked effect upon crop yields. For example the 



