EFFICIENCY OF NITROGEN FERTILIZATION IN WHEAT AND BARLEY GROWN UNDER DIFFERENT FERTILIZATION SYSTEMS

Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Nedyalka YORDANOVA, Nikolay MINEV, Svetla KOSTADINOVA

Agronomic efficiency and Partial factor productivity of N were studied in wheat and barley grown in a long-term fertilizer trial and fertilization systems: Control, N₃₀₀P₄₀₀K₆₀₀+18 t vetch-oat mixture/ha, N₆₀₀P₄₀₀K₆₀₀ (stock fertilization), N₉₀₀P₄₀₀K₆₀₀, N₆₀₀P₄₀₀K₆₀₀+30 t manure/ha, N₆₀₀P₄₀₀K₆₀₀+4 t straw/ha, N₆₀₀P₄₀₀K₆₀₀ (annual fertilization) (І-ІV crop rotations); Control, N₃₀₀P₃₀₀K₄₀₀, N₆₀₀P₃₀₀K₄₀₀, N₉₀₀P₃₀₀K₄₀₀, N₆₀₀P₃₀₀K₄₀₀+40 t manure/ha, N₆₀₀P₀K₄₀₀, N₆₀₀P₃₀₀K₀ (V-VII rotations); Control, N₂₅₀P₃₀₀K₂₀₀, N₅₀₀P₃₀₀K₂₀₀, N₇₅₀P₃₀₀K₂₀₀, N₂₅₀P₁₅₀K₀+60 t manure/ha, N₅₀₀P₀K₂₀₀, N₅₀₀P₃₀₀K₀ (VIII rotation). The studied rates were N₆₀, N₁₂₀, N₁₈₀ (wheat) and N₄₀, N₈₀, N₁₂₀ (barley). A high efficiency of N₆₀ and N₄₀ was found when N was incorporated into organo-mineral fertilization systems. Appling of 18 t vetch-oat mixture∙ha or 60 t manure∙ha increased Agronomic Efficiency of N (AE-N) and Partial Factor Productivity of N (PFP-N) to 54.5-71.3 and 81.8-112.8, respectively. The prolonged exclusion of phosphorus fertilization in the crop rotation strongly decreased AE-N and PFP-N up to 0.7-13.7.

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{simplepopup popup="false" name="Citation31"}YORDANOVA N., MINEV N., KOSTADINOVA S. 2024, EFFICIENCY OF NITROGEN FERTILIZATION IN WHEAT AND BARLEY GROWN UNDER DIFFERENT FERTILIZATION SYSTEMS. Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1, ISSN 2285-5785, 245-254. {/simplepopup}