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Juglone Inhibits Pine Growth Under Certain Moisture Regimes
Author(s) -
Fisher R. F.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200050030x
Subject(s) - juglans , juglone , edaphic , juglandaceae , loam , allelopathy , red pine , moisture , pinus densiflora , water content , soil water , bark (sound) , environmental science , botany , pinus <genus> , biology , chemistry , ecology , germination , soil science , geology , geotechnical engineering , organic chemistry
Black walnut ( Juglans nigra L.) produces juglone (5‐OH‐1, 4‐napthoquinone), a phytotoxin that has allelopathic effects on certain plant species. Field studies were conducted in southwestern Ontario, Canada, in mixed plantations of red pine ( Pinus resinosa Ait.), white pine ( P. strobus L.) and walnut growing on the Brant‐Tuscola‐Colwood catena of fine sandy loam soils. On excessively drained Brant sites pine often suppressed the walnut while on imperfectly drained Tuscola and poorly drained Colwood sites, walnut suppressed or even killed the pine. In laboratory studies juglone and its inhibitory activity readily disappeared from Brant soil under a “dry moisture regime” but remained in Brant soil under a “wet moisture regime”. The field and laboratory studies suggest that edaphic conditions play an important role in the interactions between walnut and other species.