On the test-field of the Agricultural University - Plovdiv, a field experiment was carried out for the purpose to determine biological effectiveness and selectivity of some soil herbicides in oat plants of the Dunav1 variety. One of them was the Goal 2E herbicide with active ingredient oxyfluorfen 24%.
Oxyfluorfen was introduced at a dose of 100 ml/dka after planting of oats seeds. During the vegetation period, some visible signs of phytotoxicity in the crop were observed - plant growth inhibition, leaf and vegetation tip deformation, weak chlorosis, etc.
For the purpose to determine the effects of the herbicide on oat leaf anatomy, samples from the midsection of the leaves were taken. The parameters taken into consideration were stomata number/mm2 and stomata size (μm) from the upper and lower epidermis, and size of the assimilation parenchyma (mesophyll) of the leaf.
It was established that oxyfluorfen caused considerable changes in the oat leaf anatomy, which found expression in increase of stomata number/mm2, as well as reduction of the thickness of leaf lamina (blade), compared to those in the non-treated control plants.