338 



SOIL PHYSICS AND MANAGEMENT 



to a depth of four inches or more. They may he divided into shovel, 

 disk, blade cultivators, and wceders. 



Fio. 155. Ordinary corn planter with attachment for planting cowpeas in hill or row with 



corn. 



Fio. 150. Three-shovel cultivator. 



The shovel cultivators (Fig. 156) vary in the number and size 

 of the shovels used. There may be two large sliovels on each gang, 

 three medium, or four small ones. The depth to which they go 

 varies directly with the size of the shovels. It is not unusual to 



