14 



MASS. EXPERIMENT STATION BULLETIN 439 



Figure 7. 



A. Boulders Recently Pushed Out With a Bulldozer. 



B. Pushing Boulders into a Wall at Edge of Field. 



Cost of removing boulders as the first step in pasture improvement ranged 

 from $30 to $120 per acre for the bulldozer charge with $50 to $70 the most com- 

 mon amount. Additional costs of picking smaller stones and broken fragments 

 ranged from $10 to $25 per acre to make total costs of $70 to $90 per acre before 

 the land was harrowed or plowed. The time required to remove boulders ranged 

 from 12 to 15 hours per acre in most cases. 



Costs of clearing rough stony land for row crops were $20 to $30 higher per 

 acre because a more thorough job was necessary. Where a power shovel was 



