. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 802 Contribation from the Bureaa 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 BOTANI- CAL COMPOSITION AND PHYSICAL AND CHEMICAL CHARACTERISTICS. By Alfred P. Dachnowski, Physiologist, Soil-FertiUty Investigations. CONTENTS. Page. The present status of peat utiliza- tion 1 Definitions and points of view in classifying peat materials 9 A tentative classification of i
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 802 Contribation from the Bureaa 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 BOTANI- CAL COMPOSITION AND PHYSICAL AND CHEMICAL CHARACTERISTICS. By Alfred P. Dachnowski, Physiologist, Soil-FertiUty Investigations. CONTENTS. Page. The present status of peat utiliza- tion 1 Definitions and points of view in classifying peat materials 9 A tentative classification of im- portant types of peat materials 14 The aquatic group of peat ma- terials 14 Macerated type Irt Colloidal type 22 Doppleritic type 23 The marsh group of peat mate- rials 23 Reed-grass type 26 Sedge type 27 Brown-moss type 28 Page. A tentative classification of impor- tant types of peat materials— Continued. The bog group of peat ma- terials 29 Bog-moss type 32 Arrow-grass type 33 Cotton-grass type 33 Bog-shrub type 34 The swamp group of peat ma- terials 34 Alder-willow type 36 Birch type 36 Deciduous-forest types 36 Coniferous-forest types 37 Literature cited 39 THE PRESENT STATUS OF PEAT UTILIZATION. The problem of peat utilization may be analyzed from several points of view, but only a few aspects of the subject are of essential importance to emphasize at this time. Among the peat problems in question none, in the opinion of the writer, is so serious as the failure to realize the existence of the important grades or types of this mate- rial in regard to quality and their relative value for agriculture or other uses. There is a growing recognition of the fact that the term " peat" is too general to be applied to plant remains essentially different in composition, which have dijfferent agricultural and technical possi- 132927°—19—Bull. 802 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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