RESULTS OF MEASUREMENTS. 



53 



benefits arose during the dry period through the saving of moisture 

 effected by the windbreaks early in the season. The main credit to 

 windbreaks for corn protection in the season of 1908 must be given 

 in connection with heat. In many causes increased heat would damage 

 crops were evaporation not checked at the same time. 



Measurements made in two fields of small grain show beyond a 

 doubt that great benefit may be expected from windbreaks in dry 



JQO 



JM LEWAff0 



\ 



DIAGRAM 24. Protective efficiency of young honey locust hedge. For wind velocities of from 5 to 10 

 miles per hour. Height, 30 feet; 29 readings. 



seasons through their conservation of moisture. . The first case was 

 that of a wheat field partly protected on its south border by a dense 

 grove of honey locust and soft maple. (See diagram 34.) Maple 29 

 feet high stood next to the wheat. Shading and sapping had caused 

 almost complete loss of crop for a distance of 45 feet from the base 

 of the trees. Immediately beyond this the stand of grain was much 

 better than the normal for the field. Samples of the grain were 

 taken at various points in the shelter of the windbreak, thrashed out 



