Revista Brasileira De Herbicidas 2014; 13(1): 15-22
Tolerance of sunflower to herbicide application in post-emergence
The most used method in weed control is chemical, though, the sunflower is very sensitive, especially the post-emergent herbicides that control dicotyledonous weed species. Thus, the aim of this work was to evaluate the tolerance of sunflower to different herbicides as well as to evaluate the effect of these products on physiological characteristics of sunflower plants. For this, we assembled an experiment conducted in a greenhouse. We used a completely randomized design with five replications. The treatments consisted of 10 herbicides applied in post-emergence of sunflower plants and a check without herbicide. The check was used to evaluate the growth and physiological characteristics of sunflower plants. The herbicides interfered variously in sunflower plants, and the crop appears more tolerant to flumioxazin herbicide, fenoxaprop-p-ethyl + clethodim, haloxyfop-p-methyl, fluazifop-p-buthyl and clethodim regarding related variables or sunflower growth, highlighting that these herbicides cited caused lesser degree of intoxication had on the culture. In assessing the physiological characteristics, fomesafen, the mixture (fluazifop-p-buthyl + fomesafen) and chlorimuron-ethyl stand out with the most harmful to culture, adversely affecting A, gs, E and ΔC plants treated with these products.
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