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Title	A search for phytotoxins influencing germination and early growth of ponderosa pine.
Creator	Kelsey, Rick G.
Contributor	Harrington, Michael G. ;<br> Intermountain Forest and Range Experiment Station (Ogden, Utah)
Description	A series of laboratory and field experiments were conducted to determine if mature ponderosa pines produce a substance (phytotoxin) that inhibits the germination and growth of seedlings directly under the tree crown. Neither live nor dead materials collected from ponderosa pines produced either volatile or water-soluble phytotoxins that drastically inhibited germination of seeds or growth of seedlings. Seeds overwintering beneath the canopy of mature pines, or planted in soils collected there, showed reduced germination. If weak phytotoxins were responsible, they did not inhibit growth of seedlings that germinated.
Publisher	Ogden, Utah : Intermountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1979.
Subject	Ponderosa pine - - Seedlings. ; <br> Ponderosa pine - - Growth.
Relation	USDA Forest Service research paper INT ; 216
Source	A 13.78:INT-216
Date Original	1979-02-01
Date Digital	2007;
Type	text
Format	application/pdf
Resource Identifier	mtg002084
Contributing Institution	The University of Montana
Language	en
Digitization Specifications	Scanned by Lacey Gibbons using an OpticBook 3600 scanner at 400 dpi, 8 bit gray scale. Master images stored as TIFF and derivatives presented as PDF. Abbey FineReader 8.0 used for optical character recognition.

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