16 



MASS. EXPERIMENT STATION BULLETIN 439 



shovel took out two rows of trees in one trip through the orchard and left them in 

 a windrow. Sale of cordwood paid for the cost of tree removal, cutting wood, 

 and hauling stumps to a swamp with a tractor and stoneboat. Trees in rows 

 were pushed out with the bulldozer in 2^ minutes per tree, and by the power 

 shovel in 4 minutes per tree. In the latter case, trees were older and larger. The 

 bulldozer was easier to maneuver than the gas shovel and was more adaptable 

 for removal of scattered trees. The land was graded after iree removal and trees 

 were pushed out of the orchard in some instances. Soil was shaken from roots 

 and sod was not torn up by tracks when the gas shovel was used. 



Figure 9. 



A. Blastini; a Ditch Through Swampy Pasture Land. 



B. Ditch Blasted in Heavy Wet Land 



