UNITED STATES DEPARTMENT OP AGRICULTURE 
BULLETIN No. 821 
Contribution Trom the Bureau of Plant Indcstry 
WM. A. TAYLOR, Chief 
Washington, D. C. 
FROST PROTECTION IN LEMON 
ORCHARDS 
By 
A. D. SHAMEL, Physiologist, L. B. SCOTT, Pomologlst, and 
C* S. POMEROY, Assistant Pomologlst, OMce of Hort^ 
cultural and Pomological Investigations 
CONTENTS 
Page 
Climatic Conditions in the Coroca District 1 
Method of Orchard Heating S 
Objects of the Invesagationa ..... S 
Plan of the Investigations 7 
Method of Secnring Records 9 
Presentation of Data. . 10 
Page 
Lessons Taaght by the Investigations in 
1913 22 
The Behavior of Heaied and Nonheated 
Plats in 1914 * . 25 
Ccmparison of the Eureka and Lisbon 
Varieties 27 
Sumns^ry . . *, 29 
WASHINGTON 
GOVERNMENT PRINTING OFFICS 
1920 
