72 FIELD AND LABORATORY STUDIES OF SOILS 



Discussion: The purpose of the plow is to invert and 

 pulverize the surface six or eight inches of soil and to turn 

 under weeds and other trash. The plow is a three-sided 

 wedge, the two plane sides of which press on the bot- 

 tom and the landside of the furrow wliile the third curved 

 surface lifts and turns the furrow slice. 



Great care should be exercised to have the plow in proper 

 adjustment, for if improperly set the implement is difficult 

 to operate and does inferior work. If possible make a trip 

 to the field and observe the operation of the plow. 



Care must be taken not to plow when the soil is too 

 wet. If plowed too wet most soils ]:)ecomo puddled and 

 cloddy and may have their productive capacity impaired 

 for a number of years. 



