March, 1916 



Circular No. 27 



RENEWING THE SHELTERBELT 



In cover figure the new generation of trees have grown for five years under 

 the old stand. Even shade-enduring trees, although getting a start, will not 

 make a satisfactory growth in the dense shade of other trees, consequently the 

 old stand should be opened up either gradually or at one operation. 



AGRICULTURAL EXPERIMENT STATION 



IOWA STATE COLLEGE OF AGRICULTURE 



AND THE MECHANIC ARTS 



Forestry Section 



FORSTRY 



COLLEGE Or AGRICULTURE 

 UNIVERSITY OF CALIFORNIA 



Ames, Iowa 



