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EFFECT OF NITROGEN, PHOSPHORUS AND ZINC FERTILIZATION ON YIELD, QUALITY AND NUTRIENTS UPTAKE OF BERSEEM-BARLEY MIXTURE

Two field experiments were conducted in clay soil at the Agricultural Farm of Sids Agricultural Research Station, Agricultural Research Center during two seasons 2010/2011 and 2011/2012, consecutively to investigate the effect of three nitrogen levels (0, 15 and 30 kg N/fed), three phosphorus levels, i.e. 6.8, 9.6 and 13.1 kg P/fed and two zinc application levels (0.0, and 10 kg zinc sulphate/fed) on total fresh and dry forage yield, forage quality; namely, N, protein, P and Zn concentration and N, P and Zn uptake by berseem-barley mixture. Total fresh and dry forage yield significantly increased by N, P and Zn fertilization. Nitrogen and protein percentage positively affected only by nitrogen fertilization. While, phosphorus concentration significantly affected by raising phosphorus levels only. Meanwhile, zinc concentration increased by zinc application and decreased by increasing phosphorus levels. Nitrogen, phosphorus and zinc fertilization increased nitrogen uptake. Whereas, phosphorus or zinc uptake responded only to phosphorus or zinc application, respectively. All studied parameters affected by the interaction between phosphorus and zinc, where added phosphorus at higher rate inhibited the effectiveness of zinc.