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Planting-Site Preparation with Herbicides to Aid Conifer Reforestation

Published online by Cambridge University Press:  12 June 2017

Edward J. Dimock II ,
Thomas F. Beebe  and
Ernest B. Collard
Edward J. Dimock II
Affiliation:
U.S. Dep. Agric., For. Serv., Pacific Northwest For. Range Exp. Stn., Forestry Sci. Lab., 3200 Jefferson Way, Corvallis, OR 97331
Thomas F. Beebe
Affiliation:
U.S. Dep. Agric., For. Serv., Wenatchee Natl. For., Box 811, Wenatchee, WA 98801
Ernest B. Collard
Affiliation:
U.S. Dep. Agric., For. Serv., Wallowa-Whitman Natl. For., Box 907, Baker, OR 97814
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Abstract

Seven herbicides and two herbicide combinations were applied once either preplant or postplant to control perennial grasses and forbs as planting-site preparation for 2-yr-old seedlings of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) and Douglas fir [Pseudotsuga menziesii var. glauca (Beissn.) Franco] at locations in Washington and Oregon. Hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H, 3H)-dione] applied at 2.2 kg/ha provided most effective and lasting herbaceous weed control in both states. A combination of dalapon (2,2-dichloropropionic acid) and atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] applied at 9.0 + 4.5 kg/ha also proved similarly effective. In Washington, each conifer species responded with exponential growth increases over a 6-yr period. For ponderosa pine and Douglas fir, respectively, hexazinone treatment increased tree height by 58 and 70%, stem diameter by 70 and 69%, and stem-volume yield by 387 and 650% as compared to untreated checks. Corresponding gains for the two conifers associated with dalapon + atrazine were 73 and 54% in height, 63 and 46% in diameter, and 421 and 349% in yield.

Keywords

Pinus ponderosaPseudotsuga menziesiiatrazinedalaponhexazinone
Type
Research Article
Information
Weed Science , Volume 31 , Issue 2 , March 1983 , pp. 215 - 221
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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