Content and uptake of macroelements by the biomass and grain of barley (Hordeum vulgare L.) grown as aftereffect

A field study with spring barley (Hordeum vulgare L.) was conducted on the area of long-term balance experiment in Tsalapitsa village near Plovdiv (Bulgaria), alluvial-meadow soil. Mineral fertilization not applied to this crop order equalize regarding nutrient content. The grown before maize 4 variants and one control variant: N0P0, N100Р50, N150Р100, N200Р150, N250P200. present aimed evaluate productivity, content uptake macronutrients (N, P, K, Ca Mg) biomass barley, as aftereffect. Due previous crop, different residual amounts nutrients soil lead significant variability yields. highest grain yield obtained variant N250P200 - 3978.8 kg/ha, approximately four times higher than control. Nitrogen is also influenced by variants, being lowest 1.25%, N200P150 2.13% 2.09%, respectively. Mg contents lower. With total depending experiment, between 23.2 132.7 kg N/ha; 26.6 146.3 K/ha 9.3 36.5 P/ha were exported from field. good regression relationship found nitrogen export (R2 = 0.859, P≤0.001).