426 ARID AGRICULTURE. 



nate trees are opposite the space left in the next 

 row. Set the rows at right angles to the prevail- 

 ing winds on the sides of the farm from which 

 the winds come. This will be on the West and 

 North or Southwest and North sides of the place 

 in most parts of the arid region. 



WIND- At high altitudes nothing has been found to 



BREAK 



TREES take the place of the cottonwood and willow. 



Evergreens, Pines and Spruce are promising, 

 but have not been planted to any extent. At 

 altitudes below five thousand feet in the middle 

 West, the Carolina Poplar, is one of the most 

 rapid-growing and successful wind-break trees. 

 It is easy to plant and by heading back it throws 

 out many side limbs from the trunks to fill in 

 the space. Plant four feet apart in rows four 

 feet apart, letting the trees alternate in each row. 

 The Russian and White Willows and Golden 

 Willows make quick-growing wind-breaks, but 

 are slower to start. These trees usually spend 

 one or two seasons making roots and small side 

 shoots before they throw up their central trunk. 

 In, many places, however, they will make thick 

 wind-breaks from twelve to twenty feet high in 

 four or five years. The Box Elder is a suitable 

 wind-belt tree in many places, and a large num- 

 ber of other kinds will be useful. The Green 

 Ash is one of the best drouth-resistant hard wood 

 trees. The "Apple King" of Kansas says he 

 plants apple trees for windbreaks and if he 



