442 IOWA DEPARTMENT OF AGRICULTURE 



variably damage the lower branches of the trees and thus make them 

 less effective for shelter. Pasturing a newly planted evergreen shelterbelt 

 should not be practiced under any conditions. 



VARIETIES FOR IOWA rLA>mNG — WHITE vi^E — (Pitms Stvobus) 



The Tree: The white pine is not only one of the most beautiful of 

 the pines but is also one of the fastest growers. It is native to the 

 northeastern part of the country, the Lake States, and extends as far 

 west as Hardin county, Iowa. For planting its range has been very 

 much extended. It will thrive on well-drained soil of almost any quali- 

 ty, but best on a light, deep sandy soil with a porus subsoil. It will en- 

 dure dry situations and also very moist soils if not continuously wet. 

 Open grown trees are generally very symmetrical in form. The fine 

 foliage has a soft appearance when contrasted with other pines. Young 

 trees will withstand shading for a few years but will not make a good 

 growth in such situations. Trees planted under the shade of broadleaf 

 trees in central Iowa, after seven years' growth, average about 18 

 inches in height while those planted under identical conditions, except 

 that they were given full light, average about 7 feet in height. 



The Wood: The wood is light in weight, soft, straight grained, only 

 moderately strong, and will not warp badly. It is used very extensive- 

 ly for lumber, cabinet making, construction work, etc. The wood using 

 industries of the state consume more white pine wood than any other 

 one species. 



Fig-. 5. — A ten-year-old shelterbelt of white pine. Some of the trees 

 are 12 to 15 feet in height. This is one of the most desirable trees for 

 shelterbelt planting. 



