78 SOILS AND FERTILIZERS 



that turns the sod over without crumbling it, while the 

 stubble plow has a steeper and shorter moldboard that 

 breaks up the soil and throws it over in a crumbled mass. 



GUAGE 

 WHEEL 

 COULTER 

 FIG. 17. Breaking Plow. 



Some object to the moldboard plow because the 

 cutting edge and the heel of the plow slide along over 

 the bottom of the furrow and smooth or plaster down 

 the moist earth so that it is more difficult for moisture 



FIG. 18. Disk Plow. 



to get from the subsoil to the plowed surface. This 

 action is avoided in the disk plows that have come into 

 use within the past few years. 

 The disk plow cuts the soil, pushes it over, and 



