132 



DRY LAND FARMING 



breaking up and pulverizing the land which it turns. 

 For hard clays and some other soils the steel mold-board 

 is probably better than the chilled. It should have in- 



5 I 



II 



terchangeable lays or shares, which must be sharpened 

 occasionally if the work is to be efficiently done. On 

 very hard soils cast shares may be cheaper. These, of 



