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Trifluralin persistence under two different soil and climatic conditions
Author(s) -
SOLBAKKEN E.,
HOLE H.,
LODE* O.,
PEDERSEN T.A.
Publication year - 1982
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1982.tb00508.x
Subject(s) - trifluralin , phytotoxicity , agronomy , soil water , chemistry , environmental science , environmental chemistry , biology , pesticide , soil science
Summary An investigation of the persistence of trifluralin was conducted as field experiments over a two year period at latitudes 60°N and 70°N respectively, paying special attention to the soil and climatic conditions. These experiments included glasshouse bioassays with Lolium multiflorum . gas‐chromatographic residue analyses and qualitative and quantitative studies on soil bacteria. Special attention was devoted to clay minerals as well as to the soil organic matter. 100 g or 500 g of trifluralin a.i. ha −1 were applied in the spring 1978 with a reapplication on half of the area the following spring (1979). The phytotoxicity of trifluralin appeared more severe on re‐treated plots compared with single applications even at approximately equal residue levels. Trifluralin did not seem to have any real influence on the total number of soil bacteria. A qualitative change of the bacterial flora was however observed as a relative increase of non‐sporeformers, Gram negatives and Actinomy‐cetes and a relative depression of the Coryneform bacteria/Arthrobacter group. Even at a recommended dosage, a carry‐over phytotoxicity the following year may occur, especially when the content of organic matter in the soil is low. Care should therefore be taken when using this herbicide on the same field in two successive years. The properties of the soil seemed to exert a greater influence than the climatic factors on the persistence of trifluralin.