Effect of fungicide treatment and nitrogen fertilisation on the yield of two breeding types of winter oilseed rape cultivars

The effect of three fungicide treatment programmes and the level spring nitrogen fertilisation on seed yield two types ofcultivars Brassica napus L. sown at different seeding rates was studied in a field experiment. subject study anopen-pollinated cultivar ‘Casoar’ restored hybrid ‘Visby’. Three plant protection programmes, levels nitrogenfertilisation (160 220 kg N⋅ha1), for each (‘Visby’—50 70 seeds⋅⋅m2; ‘Casoar’—60 80 seeds⋅m2) were included. most intensive programme comprised treatments: first autumn six-leaves-unfolded stage—BBCH 16, second stem elongation 33, third full flowering 65. One less included application sixleaves-unfolded 16 65, while 33 effectiveness influenced by intensity abiotic stress factors. average from plots protected against pathogens significantly higher than that untreated plots. increase 160 to kg⋅ha1 also caused significant yield. ‘Visby’ dependent rate compared ‘Casoar’.Keywords: Winter oilseed rape; Cultivars; Disease control; Nitrogen fertilisation; Seeding rate; Sclerotinia sclerotiorum; Leptosphaeria spp.; Alternaria spp. Botrytis cinerea.