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Herbicide Phytotoxicity as Affected by Selected Properties of North Carolina Soils

Published online by Cambridge University Press:  12 June 2017

G. W. Harrison ,
J. B. Weber  and
J. V. Baird
G. W. Harrison
Affiliation:
Thompson-Hayward Chemical Co., Raleigh, North Carolina State Univ., Raleigh, NC 27607
J. B. Weber
Affiliation:
Crop Sci. and Soil Sci., North Carolina State Univ., Raleigh, NC 27607
J. V. Baird
Affiliation:
Soil Sci., North Carolina State Univ., Raleigh, NC 27607
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Abstract

Preemergence applications of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine], chloramben (3-amino-2,5-dichlorobenzoic acid), fluometuron [1,1-dimethyl-3-(α,α,α-trifluro-m-tolyl)urea], propachlor (3-chloro-N-isopropylacetanilide), and trifluralin (α,α,α-trifluro-2,6-dinitro-N,N-dipropyl-p-toluidine) were compared in 10 North Carolina soils and the relationship of activity to soil physical and chemical properties appraised. Oats (Avena sativa L. ‘Carolee’) were used as the indicator plant in bioassays under greenhouse conditions. Fifteen soil properties were measured and correlated with herbicide I50 (50% fresh weight inhibition) values. Organic matter was the soil variable most highly correlated with herbicide phytotoxicity. There was an inverse relationship between herbicide water solubility and inactivation by organic matter. Volume weight determinations and water holding capacity values (0.1 bar) provided relatively good estimates of soil organic matter contents, but were not as highly related to herbicide activity as organic matter content.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 1 , January 1976 , pp. 120 - 126
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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