Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Tanko KOLEV, Zhivko TODOROV, Zhanar ERALIEVA
In a field experiment carried out in the Experimental and Implementation Base of the Department of Plant Growing at the Agricultural University, in non-irrigated conditions, the influence of following growth regulators was tested: Madex Top (600 ml/ha), Flordimex T Extra (750 ml/ha), Seron 480 SL (1000 ml/ha) and Trimax 175 EK (400 g/ha) on the yield of durum wheat varieties Deyana and Zvezditsa. The tested growth regulators have influenced to varying degrees the yield gains of the investigated durum wheat varieties. The treatment of Deyana durum wheat variety with the growth regulator Seron 480 SL (1000 ml/ha) results in an increase of the yield with 450 kg/ha (11.5%) on average over the three-year study period compared to the control. The higher grain yield of the durum wheat variety Zvezditsa with the same growth regulator is 350 kg/ha (9.8%). With second results, for both tested varieties is the variant treated with Medax Top (600 ml/ha), where the average increase of grain yield is respectively: for Deyana variety 280 kg/ha (8.7%) and for Zvezditsa variety 260 kg/ha more than the untreated control. When spraying durum wheat with Trimax 175 EC, the yield gain for Deyana is 280 kg/ha, and 250 kg/ha for Zvezditsa variety. The studied growth regulators have helped to increase the grain mass in one ear for the Deyana variety, while for the Zvezditsa variety - to increase the number of grains in one ear.
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