

®l)e ^ommoniucalti) of illa00ac()U0ettB. 



STATE BOARD OF AGRICULTURE. 



CIRCULAR No. 65. 



January, 1917. 



The Maintenance of Soil Feetility. 



CHARLES E. THORNE. 



From the Sixty-fourth Annual Report of the Massachusetts State Board 



OF Agriculture. 



BOSTON: 



WRIGHT & POTTER PRINTING CO., STATE PRINTERS, 



32 DERNE STREET. 



1917. 



