58. THE MOST COMMON* TYPE OF DEEP-WORKING COULTER-TOOTH 



CULTIVATOR 



It is excellent for breaking a crust and loosening a hard soil, but a shallow-working tool 

 with narrower teeth is better for making a mulch 



59. YOUNG CORN IN NEED OF A CULTIVATION 



This crust, formed by a beating rain, is evaporating water. It should be pulverised 

 into a mulch 



