THE NORTH DAKOTA FARMSTEAD 



its leaves to turn brown. Of late years this tree is being attacked by 

 insects and by fungous diseases. It is extensively used in tree plan- 

 tations at the Canadian Experiment Station at Indian Head, 

 Saskatchewan. 



POPLARS AND COTTONWOODS. On soils with an abundant supply of 

 moisture, the Norway Poplar, Russian Poplar and Cottonwood (Populus 

 deltoides) will produce the greatest amount of lumber that can be 



Figure 16 Row of Norway Poplars 6 years old on Experiment Station Grounds 



produced on a piece of land in 20 to 25 years. When planted in groves 

 they need to be set about 16 feet apart, as they are gross feeders and 

 will not tolerate shade. They should have either frequent cultiva- 

 tion or a good straw mulch to keep down weeds and to conserve 



