Vol. Ill OCTOBER, 1914 No. 1 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Pase 



Relative Water Requirement of Plants ----- i 

 L. J. BRIGGS and H. L. SHANTZ 



Heart-Rot of Oaks and Poplars Caused by Polyporus Dry- 

 ophilus --_--_____ ^5 



GEORGE G. HEDGCOCK and W. H. LONG 



Decomposition of Soil Carbonates ------ 79 



W. H. MacINTlRE 



A Fungous Disease of Hemp - - - - - -81 



VERA K. CHARLES and ANNA E. JENKINS 



A More Accurate Method of Comparing First-Generation 

 Maize Hybrids with Their Parents - - - _ _ gS 



G. N. COLLINS 



DEPARl^ENT OF AGRICULTURE 



WASHINGTON, D.C. 



WASHINOTON I OOVERhMtNT PBlKTlNQ OFnCE : 1»M 



