Book/Report

FZJ-2018-06630

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Das Langzeitverhalten der Herbizidwirkstoffe Chloridazon und 2,4-DP-P nach Praxisanwendung in zwei verschiedenen Böden der Bundesrepublik Deutschland

Gatzweiler, E. (Corresponding author)FZJ*

1994
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/20259

Report No.: Juel-2900

Abstract: The long-term behaviour of the herbicides [4,5-$^{14}$C]chloridazon and [phenyl-U-$^{14}$C]2,4-DP-P was studied in lysimeters (profile depth 1.1 m} with a degraded loess soil (Parabraunerde $\textit{CH1}$ and $\textit{DP1}$) and a pseudogley brown soil (Pseuddgiey-Braunerde - $\textit{CH2}$ and $\textit{DP2}$) over a two years period under field conditions. Ohloridazon was applied by preemergence to sugar beeis and 2,4-DP-P by postemergence to spring wheat. The crophusbandry was conducted in accordance with good agricultural practiee in both crop rotations of sugar Beets-winter wheat-winter barley (chloridazon for $\textit{CH1}$ and $\textit{CH2}$) and spring wheat-winter barley-winter rape (2,4-DP-P for $\textit{DP1}$ and $\textit{DP2}$). In addition, the degradation, metabolization and mineralization of the active ingredients (chloridazon for $\textit{CH3}$ and $\textit{CH4}$; 2,4-DP-P for $\textit{DP3}$ and $\textit{DP4}$) were studied in standardized experiments with both soils. Duo to its particular significance es a chloridazon degradation product, [4,5-$^{14}$C)metabolite B was observed in an 80-day degradation study ($\textit{MB1, MB2 + S}$ and $\textit{MB2-S}$) exclusively in the degraded loess soll. The most important results can besummarized as follows: 1. The $^{14}$C-residues measured in the crops of the chloridazon-treated lysirneters (approx. 2 % of the applied radiocarbon for $\textit{CH1}$ and 3 % for $\textit{CH2}$) were by a factor of 10 higher than those of the 2,4-DP-P-treated lysimeters ($\textit{DP1}$ and $\textit{DP2}$). For both active ingredients the major part of the detected $^{14}$C-activity was found in the treated crops (sugar beet and spring wheat) and also in the first subsequent crop (winter wheat) after chloridazon application. About one quarter of the radioactivity measured in the winter wheat straw (2.1 % of the applied radiocarbon, $\textit{CH2}$) represented metabolite B. 2. The $^{14}$C-residues 187 and 751 ($\textit{CH1}$) or 748 ($\textit{CH2}$) days after [$^{14}$C]chloridazon application amounted to 104.3 and 76.7 % respectively of the applied radiocarbon in the degraded loess soil ($\textit{CH1}$) and 92.1 and 64.4 % respectively in the pseudogley brown soil ($\textit{CH2}$), 103 and 776 days after [$^{14}$C]2,4-DP-P treatment. 39.9 and 19.2 % respectively ($\textit{DP1}$) were still measured in the degraded loess soil and 51.2 and 27.4 % respectively ($\textit{DP2}$) in the pseudogley brown soil. During the 105-day degradation experiments, 6 % of the applied [$^{14}$C]chloridazon was mineralized to $^{14}$CO$_{2}$ in both soils ($\textit{CH3}$ and $\textit{CH4}$). 62.4 % of the applied [$^{14}$C]2.4-DP-P was mineralized in the degraded loess soil ($\textit{DP3}$) and 57.3 % in the pseudogley brown soil ($\textit{DP4}$). The cumulative degradation curves of chloridazon do not display any significant [...]

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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