Influence of Some Stimulators on the Grain Yield and Grain Quality of Two Durum Wheat Cultivars

The research was conducted during 2010 - 2012 on pellic vertisol soil type. Factor A – cultivars, include 2 Bulgarian durum wheat cultivars: Deyana and Zvezdica (Triticum durum var. valenciae). Factor B – stimulators, include 9 variants: untreated check and 5 growth stimulators – H-40 in doses of 300 and 500 ml ha-1, XH-100 in doses of 1 and 1.2 l ha-1, TH-140 in doses of 2.5 and 2.8 l ha-1, X-80 in dose of 800 ml ha-1 and T – 100 in dose of 2.5 l ha-1. All stimulators were treated during the tillering stage of durum wheat. \nIt was found that the highest grain yield at durum wheat cultivars Deyana and Zvezdica is obtained by influence of growth stimulators XH-100 and TH-140. Increase the dose of stimulator H-40 depresses durum wheat. The lowest yields are obtained by use of stimulators X-80 and T-100 at the both durum wheat cultivars. The grain yield increase by investigated stimulators is due to the increase in the grain number per spike and the grain weight spike in main tiller and second tiller. The 1000 grain weight, test weight, virteousness, protein quantity, wet and dry gluten quantities are increased by influence of the investigated growth regulators. Physical and biochemical properties oh the grain are the highest by treatment with stimulators ХН-100 and ТН-140. The use of these two plant growth regulators is suggested as an element of the technology for growing of durum wheat.