Study on the herbicide Praxim (500 g L-1 metobromuron) applied for weed control in coriander (Coriandrum sativum L.)

Abstract

Weed control is an important part of coriander’s production. The uncontrolled weed flora can lead to severe yield losses of the crop During three vegetation seasons (2018, 2019, and 2020) a field trial with coriander ‘Mesten drebnoploden’ variety was performed. The study was stated on the agricultural land of Voyvodinovo village, Bulgaria. Our study aimed to evaluate the performance of the herbicidal product Praxim (500 g L-1 metobromuron) in increasing rates (1.50, 2.50, and 3.50 L ha-1). The untreated plot (treatment 1) was used as a control. Treatment 2 represented the economical weed-free control. The herbicide application was performed in ВВСН 12-13 (2nd-3rd true leaf unfolded). The selectivity of the herbicide for coriander and the efficacy against the existing weeds, and also the structural elements of the yield as plant height, number of branches and umbels plant-1, 1,000 seed mass, as well as the seed yields were evaluated. The seed essential oil content was also analyzed. The observations showed that the metobromuron application caused phytotoxic symptoms on coriander expressed as growth retardation at the high rate of 3.50 L ha-1. On the contrary, on those plants where the herbicide rate of 2.50 L ha-1 was applied no phytotoxic symptoms were observed and the obtained results of all studied parameters were comparable to those of the weed-free control treatment.