UNITED STATES DEPARTMENT OP AGRICULTURE 
BULLETIN No. 802 
Contribution from the Bureau of Plant Industry 
WM. A. TAYLOR, Chief 
Washington, D. C. PROFESSIONAL PAPER December 29, 1919 
QUALITY AND VALUE OF IMPORTANT 
TYPES OF PEAT MATERIAL 
A CLASSIFICATION OF PEAT 
BASED UPON ITS BOTANICAL COMPOSITION AND PHYSICAL 
AND CHEMICAL CHARACTERISTICS 
By 
ALFRED P. DACHNOWSKI, Physiologist 
Soil -Fertility Investigations 
CONTENTS 
Page 
The Present Status of Peat Utilization 1 
Definitions and Points of View in Classifying Peat Materials 9 
A Tentative Classification of Important Types of Peat Materials 14 
Literature Cited 39 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1919 
