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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Stability of herbicides and herbicide tank-mixtures at winter oilseed canola by influence of different meteorological conditions

G. Delchev
Abstract. During the period 2010 – 2012, on the experimental field of the Field Crops Institute – Chirpan was carried out a field experiment with conventional Maximus hybrid PR44D06 (Brassica napus). A total of 15 variants were investigated. Canola hybrid from Maximus product line which is included in the study eliminates the need for growth regulators. The efficacy of the herbicide Salsa when used separately without the other partner herbicide is higher when treated with adjuvant Trend compared to adjuvants Codacide and Silvet. At tank mixtures of Salsa and Butizan, herbicide efficacy and crop long action against weeds are higher when they are introduced with adjuvant Codacide. When herbicide tank mixture Salsa + Pantera is treated with adjuvant Codacide synergism is accounted. At tank mixtures of Salsa + Agil, higher efficiency is accounted in its joint use with adjuvant Trend. Technologically the most valuable are tank mixtures of herbicides Salsa and Butizan with adjuvant Codacide, followed by these with adjuvant Trend. From the viewpoint of technology for growing winter oilseed canola, high rating also have tank mixtures of Salsa with antigrass herbicides Pantera and Agil, followed by that of Salsa with Runway. Combinations of Salsa with adjuvants Trend, Codacide and Silvet, but without a partner herbicide, have low rating because they are inefficient against grassy weeds and absence of soil action.
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