Revista Brasileira De Herbicidas 2020; 19(1): 1-8
INTERACTION OF METRIBUZIN AND NITROGEN IN CARROT CROP
Nitrogen is the most extracted nutrient in carrot fields. However, high N doses can favor thegrowth of aerial part in relation to the root of the plant. The application of metribuzin canalter the biomass partition in favor of the roots. Thus, the objective of this research was toevaluate the effect of post-emergence metribuzin application and its interaction withnitrogen on the axial and radial growth and yield of carrot roots. Three field experimentswere carried out in different growing sites. Experimental design was a randomized completeblock design with four repetitions, in a 2×3 factorial scheme, with two doses of metribuzin(0 and 432 g ha-1) and three N doses (0,30 and 90 kg ha-1). Root length and diameter, drymatter mass of shoot (MSPA) and root of plants and root productivity were evaluated.There was no interaction between metribuzin and nitrogen in the studied variables. Ingeneral, there was no influence of metribuzin and N on MSPA and root length. Metribuzinreduced the dry matter mass of the carrot root as a consequence of the reduction in carrotroot diameter. However, it did not influence the commercial and total yield of the carrot.The application of metribuzin associated with N fertilization does not influence the axial orradial growth of the carrot root and consequently does not alter the yield of the carrot.
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