Sulfosulfuron ve Mesosulfuron + Iodosulfuron'un topraktaki kalıntılarının ayçiçeği fide bioassayi ile belirlenmesi

Laboratuvar koşullarında ayçiçeği fide bioassayi ile sulfosulfuron ve mesosulfuron + iodosulfuron'un topraktaki kalıntılarının test bitkisine etkileri belirlenmiştir. Her iki herbisit için kök parametrelerinin sürgün parametrelerinden daha hassas olduğu görülmüştür. Kök uzunluğunun herbisitlerin topraktaki kalıntılarına en hassas biyolojik parametre olduğu belirlenmiştir. Herbisitlerin kalıntı etkilerinin belirlenmesinde 15 gün ve 30 günlük süreler arasında fark önemli bulunmamıştır. 15 günlük denemede I50 değerinin sulfosulfuron için 0.88, mesosulfuron + iodosulfuron için 1.66, 30 günlük denemede ise bu değerin sulfosulfuron için 1.19, mesosulfuron + iodosulfuron için 1.46 µg kg-1 olduğu hesaplanmıştır.

Anahtar Kelimeler:

Sulfosulfuron, mesosulfuron + iodosulfuron, topraktaki kalıntı, bioassay

Determination of Sulfosulfuron and Mesosulfuron + Iodosulfuron residues in soil by sunflower seedling bioassay

Effects of the soil residues of sulfosulfuron and mesosulfuron + iodosulfuron on sunflower as assay plant were determined by seedling bioassay in growth chamber. Root parameters were more sensitive than shoot parameters for both herbicides. Root length was the most susceptible biological parameter to the soil residues of these herbicides. Differences of between 15 days and 30 days were not important to determine the effects of herbicide residues. I50 values for sulfosulfuron, mesosulfuron + iodosulfuron at 15 days and 30 days assays were 0.88, 1.66 and 1.19, 1.46 µg kg-1, respectively

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