22 WINDBREAKS. 



TABLE 1. Amount and distribution of shade cast by various species. 



i Where the percentage exceeds 100 it means that the amount of light cut off is greater than that which 

 would fall xipon a strip of ground as wide as the height of the trees. 



Crown density and branching. Tables 1 and 3, taken together, show 

 that the value of the light absorbed by the trees and cut off from the 

 crops adjacent to them is proportional to the density of the crowns. 

 In the order of their tolerance, or ability to endure shade and thus to 

 maintain heavy crowns, the trees may be listed as follows, with the 

 most tolerant placed first: Osage orange, soft maple, green ash, 

 honey locust, cottonwood. Honey locust, however, must be classed 

 as the most severe shader of all except osage orange, and the reason 

 is at once seen by reference to Table 2, which shows honey locust to 

 have the most extensive branches. In this table the species are 

 arranged in the order of their branching extent, those with shortest 

 branches first : 



TABLE 2. Branching extent of various trees. 



