Estimation of efficiency of metribuzin to weeds control in coriander crops

Abstract

There are no chemicals in Russia to protect vegetative coriander from a complex of dicotyledonous and monocotyledonous weeds. The expediency of using metribuzin for this purpose was assessed. Field small-plot trials with herbicide Zenkor Ultra SC (metribuzin, 600 g/l) were carried out in three agricultural territories with differing climatic conditions: Krasnodar, Omsk and Astrakhan Regions. Weed counts were using the quantitative and weight method. The efficiency of herbicide was calculated to the control without treatment. As a result of trials, three groups of weeds were identified: 1) species highly sensitive to herbicide: Chenopodium album L., Amaranthus retroflexus L., Salsola tragus L. (efficiency 90-95%); 2) species medium sensitivity: Solanum nigrum L., Polygonum aviculare L. (efficiency 50-65%); 3) poorly controlled weeds: Ambrosia artemisiifolia L., Galium aparine L. (efficiency less 30-40%). Increases yield of seeds of coriander variety Yantar after Zenkor Ultra SC use amounted to 26.1-37.3%. Phytotoxicity was noted on varieties Ranniy and Santo in one of the years and this needs future estimation sensitivity of varieties to metribuzin.