FIELD AND LABORATORY 



STUDIES OF CROPS 



AN ELEMENTARY MANUAL 

 FOR STUDENTS OF AGRICULTURE 



BY 



A. G. McCALL 



Professor of Agronomy, Ohio State University 



FIRST EDITION 



FIRST THOUSAND 



NEW YORK 



JOHN WILEY & SONS, Inc. 

 London: CHAPMAN & HALL, Limited 

 1916 



