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UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1105 



Washington, D. C. ▼ April 27, 1923 



NATURAL REPRODUCTION 



OF WESTERN YELLOW PINE 



IN THE SOUTHWEST 



By 



G. A. PEARSON, Silviculturist 



Fort Valley Forest Experiment Station 



Forest Service 



CONTENTS 



Page. 



Purpose of Study 1 



Review of Previous Investigations 2 



Recent Developments in the Study 4 



Factors Influencing Reproduction 9 



Seed Supply 9 



Climate 22 



Sofl 29 



Herbaceous Vegetation 38 



Cutting 56 



Brush Disposal 92 



Grazing . 115 



Miscellaneous Enemies 133 



Summary 135 



Literature Cited 142 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1923 





