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¹ Tohumluk Tescil ve Sertifikasyon Merkezi Müdürlüğü, ANKARA
² FAO- ANKARA - The stimulation of cereal seeds previous to sowing and the effect of the stimulation on germination rate, plant height and root lenght were investigated by using 2 wheat and 2 barley cultivars. The stimulants used were KNO₃ (2%), thiourea (2%), gibberellic acid and tap water. Germination rate is increased by KNO₃, plant height by gibberellic acid and root lenght by KNO₃ and thiourea. Stimulants increased the yield of barley cv. Zafer 160 only but not others. Keywords : Germination; chemical stimulants; gibberellic acid; thiourea