SIZE OF EFFICIENT WINDBREAKS. 



conifer will be necessary to insure the continued efficiency of the belt. 

 Green ash succeeds fairly well when planted a few years after the 

 cottonwood. Red oak should be given a trial. On good ground this 

 species grows rapidly, and will yield post material of about the same 

 value as green ash; or the trees may be retained after the cottonwood 

 is cut, and grown to a larger size. 



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DIAGRAM 35. Plan for location of windbreaks on a farm in the Middle West. 



Of the conifers adapted to use as an understory to cottonwood,, 

 the spruces are the most promising. Norway spruce, very successful 

 in the East, will not thrive where moisture is lacking. The same 

 is true of the native eastern spruces. The Black Hills spruce stands 

 the test of summers and winters on the plains of South Dakota. 



