54 
BULLETIN" 479, U. S. DEPARTMENT OF AGRICULTURE. 
and it is not so suitable for the purpose as the spade. It requires 
a more skilled operator, the depth of the trench is limited by the 
depth of the blade, and it is more difficult to run the lines straight. 
Plow: Where the transplants are in long rows a plow has been 
tried for making the trenches and has worked admirably. The 
plow is of the small one-horse type and is equipped with an 8-inch 
(depth of trench) landslide, a short moldboard, and a shield to divert 
all the soil toward the moldboard side. 
"MAST" transplant board 
PerspecTive View 
Enlarged Transverse Section 
D 
___^ 

Fig. 6. — Transplant board. 
TRANSPLANT BOAEDS. 
Transplant boards are all essentially the same in principle. There 
are two distinct types, the basis for the distinction being that in one, 
exemplified by the "Mast board." so called from its designer, Mr. 
William H. Mast, seedlings are threaded into the board from a bench 
and afterwards lowered into the trench ; while in the other, exempli- 
fied by the "Michigan board," seedlings are threaded into the board 
as it lies on the ground projecting over the trench (fig. 6). With the 
first board a crew of from 5 to 7 men (2 planters, 1 or more trench- 
