UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 821 



Contribution from the Bnrean of Plant Industry 

 WM. A. TAYLOR, Chief 



Washington, D. C. 



Jane 4, 1920 



FROST PROTECTION IN LEMON 

 ORCHARDS 



By 



A. D. SHAMEL, Physiologist, L. B. SCOTT, Pomologlst, and 

 C. S. POMEROY, Assistant Pomologist, Office of Horti- 

 cultural and Pomological Investigations 



CONTENTS 



Climatic Conditions In the Coroaa District I 



Method of Orchard Heating 3 



Objects of the Investigations 5 



Plan of the Investigations 7 



Method of Secoring Records 9 



Presentation of Data 10 



Lessons Taoght by the Investigations In 

 1913 <<>. 22 



The Behavior cf Heated and Nonheated 

 Plats in 1914 25 



Comparison of the Enrelca and Lisl>on 

 Varieties 27 



Sumnory 29 



WASHINGTON 

 GOVERNMENT PRINTING OETICB 



1920 



