118 SOILS 



A plow that does not accomplish both of these re- 

 sults is faulty. All refuse should be covered so 

 deeply that it is not brought to the surface by the 

 harrow. This can usually be done without com- 

 pletely inverting the furrow slice. A broad and 

 deep furrow buries trash better than one that is 

 narrow and shallow. If tall herbage is to be 

 plowed under, as in plowing under a green manur- 

 ing crop or a heavy growth of weeds, a chain with 

 one end attached to the beam of the plow and the 

 other to the end of the double-tree will make it easier 

 to bury the plants, especially if a jointer is used 

 also. Sometimes it is necessary to rake the coarsest 

 part of the manure into the furrow in order to 

 bury it completely. Herbage and refuse that is 

 plowed under deeply decays more rapidly than if 

 it is turned under with a shallow furrow, because 

 the surface soil is dryer. When there is a large 

 amount of herbage or trash to bury the team should 

 be stronger and the furrow deeper than if the soil 

 is unencumbered. If the furrow slice is com- 



Eletely inverted herbage and trash is buried best, 

 ut tne soil is not pulverised much. It is possible 

 to bury herbage and trash with a crumbling furrow. 

 Pulverising the Soil. Unless a plow pulver- 

 ises the soil so that the harrow can finish tne pro- 

 cess easilv, it is not doing all that should be ex- 

 pected of it. Plows differ greatly in the way which 

 they leave the furrow. The furrow-slice is some- 

 times completely inverted and lies flat on the bot- 

 tom of the preceding furrow ; this is called "flat- 

 furrow plowing." Other furrows stand nearly 

 edgewise without being crumbled much; this is 

 called " overlapping-f urrow plowing." Still others 

 are broken to pieces entirely; this is called "rol- 

 ling-furrow plowing." 



