Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Dragomir PLAMENOV, Pavlina NASKOVA, Boyka MALCHEVA, Nadezhda ALTUNYAN
Three variants of fertilization were carried out at common winter wheat of Avenue variety on a total area of 9 ha. Pre-sowing application was performed with Yara Mila Triple (16% N, 16% P2O5, 16% K2O) and double nitrogen feeding with Yara Vera Amidas (40% N, 14% SO3) and Yara Bela Sulfan (24% N, 15% SO3, 11% CaO). The pre-sowing study of soil indicators showed that phosphorus can be blocked and more difficult to access for plants due to medium acid reaction of the soil. High levels of potassium have been reported, but additional mineral fertilization is still needed. The values of magnesium are very high, which requires saturating the soil solution with potassium ions until the normal ratio K: Mg of 3: 1 is reached. Very low sulphur content has a direct effect on nitrogen efficiency. The presented biomass maps show its increase after fertilization. Higher productivity, hectolitre weight and protein content in the grains were found for the harvest from field 1 (highest nitrogen fertilizer rate), which confirms the leading role of the macronutrient as a yield factor.
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