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Medientyp:
E-Book;
Bericht
Titel:
Das Langzeitverhalten der Herbizidwirkstoffe Chloridazon und 2,4-DP-P nach Praxisanwendung in zwei verschiedenen Böden der Bundesrepublik Deutschland
Erschienen in:Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 2900, 177 p. (1994).
Sprache:
Deutsch
Entstehung:
Anmerkungen:
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Beschreibung:
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 ...