A two-factor experiment was carried out on pellic vertisol soil type in 2007-2009 on the experimental field of the Cotton and Durum Wheat Research Institute, Chirpan, Bulgaria. Factor A included 2 Bulgarian durum wheat cultivars – Vuzhod and Saturn, which belong to var. valenciae. Factor B included 6 rates – non-treated control and 3 stimulators: Tritimil – 300 ml/ha, Napsil – 300 and 500 ml/ha, Cemofol – 500 and 700 ml/ha. All stimulators were treated in the tillering stage of the durum wheat. Stimulators Tritimil, Napsil and Cemofol decreased less the 1-st and 2-nd overgrown internode length of cultivar Saturn compared with cultivar Vuzhod. Napsil and Cemofol increased grain yield by 9.0 % and 10.9 % in cultivar Vuzhod and by 10.3 % in cultivar Saturn. Both stimulators have equal or increased effectiveness compared with the standard Tritimil. The studied stimulators increased the vitreousness, protein content, wet and dry gluten contents. Stimulators Tritimil, Napsil and Cemofol increased germination energy and seed germination and decreased the waste grain quantity.
G. Delchev, D. Nenkova, D. Stoychev