Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Ivan VELINOV, Zhivko TODOROV, Svetla KOSTADINOVA
A pot experiment was carried out to determine the accumulation and distribution f dry mass and nitrogen in sorghum depending on the nutritional level. The plants were grown on eight levels of utrition – N0P0K0, N0P200K200, N600P0K0, N200P200K200, N400P200K200, N600P200K200, N800P200K200, N600P400K400. The ifferent levels of nutrients were created by applying of NH4NO3, Ca(H2PO4)2 and KCl dissolved in water. It was established hat plants accumulated higher aboveground dry biomass and nitrogen at N600P200K200 and N600P400K400 levels. The fertilization 600 mg N.kg-1 soil increased the grain nitrogen concentration both applied alone and in combination ith two levels of phosphorus and potassium P200K200 and P400K400. The fertilization levels decreased the harvest ndex of sorghum compared to the control plants. The nitrogen harvest index changed from 47.8% at N800P200K200 to 59.7% at N200P200K200. Nitrogen harvest index at N800P200K200 fertilization had the lowest value 47.8% of all studied levels.
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