322 DRY-FARMING 
Steam, gasoline, and electricity have all been sug- 
-gested. The steam traction engine is already a fairly 
well-developed machine and it has been used for 
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Horizontat Plan, 
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Fic. 87. Utah dry-farm weeder. 
plowing purposes on many dry-farms in nearly all the 
sections of the dry-farm territory. Unfortunately, 
up to the present it has not shown itself to be very 
satisfactory. First of all it is to be remembered that 
the principles of dry-farming require that the top- 
soil be kept very loose and spongy. The great trac- 
tion engines have very wide wheels of such tremen- 
i o 
