PREPARING THE SEED BED 17 
be a complete inversion of the furrow slice. With the excep- 
tion of heavy sods it is better to have the furrow slice slightly 
on edge since it will work up more easily than if completely 
inverted. The ends sought in plowing are to alter the texture 
of the soil and to bring to the surface new soil; to bury com- 
pletely all vegetation and trash and to pulverize and aérate 
the soil. 
This pulverizing and aérating of the soil we consider the 
chief objects of plowing. The plow may invert the soil in 
THREE-HORSE SULKY PLOW 
This plow has one 16-inch bottom 
the most perfect manner, but if the plow fails to do the 
greater part of the pulverizing of the soil as well, and leaves 
it in such condition that the dise and harrow cannot finish 
the work in the cheapest and best manner, it is failing to 
accomplish its principal function. 
This pulverizing of the furrow slice is done largely by the 
twist of the moldboard. For that reason a moldboard having 
a medium twist should be used. At present we are using four 
