90 



FARM MACHINERY 



Campbell advocates a method of surface cultivation to 

 conserve the moisture in semi-arid regions. The inter- 

 tillage of wheat and other small grains is included in this 

 system. An authority states that rollers should be at 

 least 2 feet in diameter, and should not weigh more than 



FIG. 62 THE SUBSURFACE PACKER 



loo pounds to the foot of width. If intelligently used, 

 the roller is no doubt a valuable implement to the average 

 farm. I 



128. The common planker, although a home-made tool, 



is a very valuable imple- 

 ment for crushing clods 

 and smoothing the sur- 

 face. It is not inclined to 

 push surface clods into 

 the soil like the roller, 

 =a but will catch them and 



FIG. 03 THE COMMON PLANKER, A . 



SERVICEABLE TOOL USUALLY pulveHZC t h C IT1 . I he 



MADE ON THE FARM planker does not adapt 



itself well to any unevenness of the surface and does not 

 pack the soil like the roller, 





