Efficacy and selectivity of herbicides and herbicide combinations at winter oilseed canola, grown by conventional and Clearfield technologies

Gr. Delchev*
Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

Abstract. During the period 2010 – 2012, on the experimental field of the Field Crops Institute, Chirpan a field experiment was carried out with imitolerant hybrid winter oilseed canola PT200CL (Brassica napus L.). A total of 16 variants were investigated. They include antigraminaceous herbicides, antibroadleaved herbicides and plant growth regulators. Herbicide Cleranda by Clearfield technology has very good efficacy against all graminaceous and broadleaved weeds and volunteers, including Sinapis arvensis and Raphanus raphanistrum and volunteers of Coriandrum sativum. Herbicides Salsa and Modown have very good efficacy against all broadleaved weeds, including against cruciferous weeds Sinapis arvensis and Raphanus raphanistrum and volunteers of Coriandrum sativum. They must be combined with antigraminaceous herbicide by mixed weeding with graminaceous and broadleaved weeds. Vegetation-applied herbicide Runway has no efficacy against Sinapis arvensis and Raphanus raphanistrum and poorer efficacy against volunteers of Coriandrum sativum. Autumn treatment by herbicide Modown causes poor phytotoxicity in canola. Spring treatment with Modown leads to a high and more difficult to overcome phytotoxicity. The highest seed yields are obtained by the variants Cleranda + Caramba and Salsa + Pantera + Folicur, followed by variants Modown + Agil + Orius and Runway + Pantera + Folicur.

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