ESTIMATES AND DISCUSSION. 83 



Tables 20 and 2 1 indicate the following points which are of interest 

 to windbreak planters : 



(1) The value of willow posts is five or six times as great as that 

 of the same material used for fuel at the price of $2 per cord. 



(2) The annual acre value of young willow which may be used 

 for posts is very high, by reason of the vigorous root growth and 

 stem development in early age. 



(3) The short-lived character of white willow and the importance 

 of the factor of interest makes the growing of willow to old age 

 unprofitable. In post production, the value of single rows seems to 

 decrease steadily after the fourteenth year. 



(4) The financial rotation of trees in the interior of groves and 

 belts is not reached so soon, because their claims on land remain 

 stationary and because the development is not so rapid when the 

 trees are crowded on all sides. 



HONEY LOCUST. 



Honey locust grows with fair rapidity. Its wood is fairly hard 

 and strong and the heartwood is durable in contact with the soil and 

 compares favorably with green ash, but is not equal to mulberry, 

 catalpa, black locust, or osage orange. 



The tree should be handled on a short rotation. It grows equally 

 well in closely planted groves and in hedge rows, but to obtain effi- 

 cient protection groves or wide belts will be found necessary. Mix- 

 ture with a more tolerant deep-rooted species is desirable, since honey 

 locust appears to lack any special ability for extending its roots in 

 search of water. The tree does well on moderately dry uplands 

 where the soil is heavy. 



Table 22 gives the results of examinations of groves and rows of 

 this species. The cases have been grouped according to the quality 

 of the situation in which they were found. The ,rea charged to 

 single rows of this species was calculated on the basis of the damage 

 to alfalfa west of a honey-locust hedge, and the damage on other 

 sides was considered proportional to the amount of light cut off on 

 these sides. The damage to alfalfa west amounted to 56.25 per cent, 

 while the value of the shade on that side was 42.53 per cent. The 

 value of the entire shade for a north-south row is 98.91 per cent, and 



the probable total shading damage - 42 53 "=130.8 per cent. 



The value of the shade of an east- west row was found to be 125.89 

 per cent. The probable damage to crops is therefore 166.5 per cent. 



