Bui. 721, U. S. Dept, of Agriculture. 



Plate II. 



Fig. 1.— The Smooth Roller, a Useful Implement in Packing the Seed Bed before 



AND after Planting. 



Fig. 2.— The Corrugated Roller, an Implement Which Breaks the Crust and 

 Ridges the Ground against Wind Effect. 



