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Soil Factors and Efficacy of Hexazinone Formulations for Loblolly Pine (Pinus taeda) Release

Published online by Cambridge University Press:  12 June 2017

Patrick J. Minogue ,
Bruce R. Zutter  and
Dean H. Gjerstad
Patrick J. Minogue
Affiliation:
School of For. and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Bruce R. Zutter
Affiliation:
School of For. and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
Dean H. Gjerstad
Affiliation:
School of For. and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Broadcast applications of hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] pellets and foliar sprays were tested at four rates for hardwood control and safety to loblolly pine (Pinus taeda L.) at each of eight study locations differing in soil characteristics. Reduction in the number of hardwoods in the stand (hardwood density reduction) was greater with the pellet on soils with more than 60% sand, while the liquid formulation was most efficacious for finely textured soils. Hardwood density reduction with the pellet was negatively correlated with percent silt, clay, soil organic matter, and cation exchange capacity, and positively correlated with percent sand. With foliar sprays, hardwood density reduction was positively correlated with hexazinone rate and negatively correlated with soil pH. Pine mortality was positively correlated to percent sand with the pellet and negatively correlated to soil pH with broadcast sprays. Regression models incorporating pine height, herbicide rate, soil texture, cation exchange capacity, soil organic matter, and acidity could explain up to 78% of the variation in hardwood density change and 77% of the variation in pine mortality. Selective control of hardwoods in young loblolly pine stands is a function of hexazinone rate, formulation, and various soil factors.

Keywords

Hardwood controlpine tolerancesoil texturesoil organic mattersoil aciditycation exchange capacity
Type
Soil, Air, and Water
Information
Weed Science , Volume 36 , Issue 3 , May 1988 , pp. 399 - 405
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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