Phytotoxicity of Bensulide and Trifluralin in Several Soils

Author:

Menges R. M.,Hubbard J. L.

Abstract

Seedlings of 19 plant species were grown in soils containing 0 to 1,000 ppm ofO,O-diisopropyl phosphorodithioateS-ester withN-(2-mercaptoethyl)benzenesulfonamide (bensulide) or 0 to 100 ppm ofa,a,a-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) to determine phytotoxicity. Standard growth curves were constructed. The concentration of bensulide required to reduce the growth of shoots 50% (GR50) ranged from 1 ppm with barnyardgrass (Echinochloa crusgalli(L.) Beauv.) to more than 1,000 ppm with carrot (Daucus carotaL., var. Long Imperator). Several plant species were more sensitive to bensulide in a Hidalgo sandy loam (pH 8.1) than in other soils including a Delfina loamy fine sand (pH 6.0). The concentration of trifluralin required to reduce the growth of shoots 50% (GR50) was not markedly affected by soil texture and ranged from 0.1 ppm with German millet (Setaria italica(L.) Beauv.) to more than 100 ppm with Long Imperator carrot. The standard growth curves have been used to quantify herbicidal activities in field soils.

Publisher

Cambridge University Press (CUP)

Subject

Plant Science,Agronomy and Crop Science

Reference7 articles.

1. Selectivity, movement, and persistence of soil-incorporated herbicides in carrot plantings;Menges;Weed Sci.,1970

2. Influence of soil incorporation and climate on herbicides in cantaloupe;Menges;Proc. Amer. Soc. Hort. Sci.,1968

3. Influence of climate and soil incorporation on herbicides in onions;Menges;Proc. Amer. Soc. Hort. Sci.,1968

4. Soil Components Determining Bensulide Phytotoxicity

5. The influence of soil characteristics on the adsorption and phytotoxicity of simazine;Day;Weed Sci.,1968

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