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Bewertung der Okosystemwirkung von Herbizidstrategien im Zuckerrubenanbau und Modellierung der Wirkstoffverlagerung im Boden

Bewertung der Okosystemwirkung von Herbizidstrategien im Zuckerrubenanbau und Modellierung der Wirkstoffverlagerung im Boden

          
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About the Book

Aufgrund der geringen Konkurrenzkraft von Zuckerruben in der Jugendentwicklung gegenuber Unkrautern kommt dem Einsatz von Herbiziden zur Sicherung der Anbauproduktivitat im konventionellen Zuckerrubenanbau eine essentielle Bedeutung zu. Dabei werden aktuell vorwiegend Mischungen verschiedener Herbizide ausgebracht, die sich in ihrer Zusammensetzung hinsichtlich Art und Anzahl herbizider Wirkstoffe und Aufwandmenge deutlich voneinander unterscheiden. Unterschiedliche Herbizidstrategien erlauben es, das standortspezifisch variierende Unkrautspektrum zielgerichtet zu regulieren. Zwar sind die okotoxikologischen Auswirkungen der einzelnen Herbizide durch das Zulassungsverfahren hinreichend bekannt, die bodenokologischen Effekte praxisrelevanter Herbizidstrategien, d. h. des Einsatzes von Herbiziden in unterschiedlicher Kombination und/oder Aufwandmenge, sind jedoch bisher kaum untersucht. Zur Untersuchung der Auswirkungen der im Zuckerrubenanbau Anwendung findenden Herbizidstrategien auf das Edaphon wurden die Indikatoren „Regenwurmpopulation“ und „biologische Aktivitat“ (Minicontainer- und Koderstreifen-Test) herangezogen. Die Versuche wurden in typischen Zuckerrubenanbaugebieten in Deutschland an insgesamt 19 sich hinsichtlich ihrer pedologischen und meteorologischen Bedingungen deutlich unterscheidenden Standorten durchgefuhrt. Die drei untersuchten Herbizidstrategien umfassten Kombinationen von zwei Herbiziden und 100 % der zugelassenen Aufwandmenge (Strategie 1), drei Herbiziden und < 50 % der zugelassenen Aufwandmenge (Strategie 2) sowie eine Minimengenstrategie mit sechs Herbiziden und ≤ 35 % der zugelassenen Aufwandmenge (Strategie 3). Weiterhin wurde die Wirkstoffverlagerung im Boden mit dem Modell FOCUS PEARL modelliert sowie das Umweltrisikos der Herbizidstrategien auf Basis der modellierten Wirkstoffkonzentrationen mittels Toxischer Einheit (toxic unit) untersucht. Zusammenfassend zeigen die Ergebnisse, dass fur die unterschiedlichen Herbizidstrategien keine negativen okologischen Auswirkungen vorliegen. Sowohl aus okologischer Sicht als auch gemaß den Grundsatzen des integrierten Pflanzenschutzes sind alle untersuchten Herbizidstrategien zur standortspezifischen Unkrautregulierung sachgerecht. Daruber hinaus kann auf Grundlage dieser Arbeit festgehalten werden, dass die Minimengenstrategie zur Applikation von Herbiziden im Zuckerrubenanbau einen Beitrag zur Reduktion des Pflanzenschutzmitteleinsatzes und Risikominderung im Sinne des „Nationalen Aktionsplans zur nachhaltigen Anwendung von Pflanzenschutzmitteln“ leisten kann.


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Product Details
  • ISBN-13: 9783954043897
  • Binding: Paperback
  • Language: German
  • Width: 200 mm
  • ISBN-10: 3954043890
  • Height: 210 mm
  • Weight: 8 gr

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