Mechanical Conditions of the Plow. 



191 



and are placed in a position to nourish the roots of the crop at 

 the precise period wlien nourishment is most needed for maturing 

 the crop. This kind of plowing prepares sod-ground for corn in 

 the best possible manner. 



J^iff. 99. 

 For land which is too bushy or too rooty with wild or swamp 

 grasses, or where ic is so sandy or mellow that pulverization is 

 not an object, a third style of plowing is adopted which requires 

 a special form of the plow. 



'%i - 





J^ig. WO. 



The action and movement of the furrow slice for fiat furrow 

 sod plowing is shown in Fig. 100, and requires no other expla- 

 nation. 



