Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Pavlina NASKOVA, Boyka MALCHEVA, Dragomir PLAMENOV
Experiment was carried out on a test field in the village of Gurkovo, on an area of 9 ha, in three variants. Fertilization was performed with fertilizer products: Yara Mila Triple (16% N, 16% P2/sub>O5/sub>, 16% H2O), Yara Vera Amidas (40% N, 14% SO3/sub>) and Yara Bela Sulfan (24% N, 15% SO3/sub>, 11 % CaO). A variety Avenue of common winter wheat was used. Macronutrients (digestible forms of N, P, K) in the soil during the tillering and maturity phenological phases of wheat shows quantitative dynamics, but between the second phase and the harvesting phase the values of macronutrients in all fertilization variants decrease, which is related to their good absorption. The used fertilizer products increase the biogenicity of soils, as established and regrouping of the separate groups of microorganisms in the composition of total microflora - reduces the amount of non-spore-forming bacteria at the expense of development of bacilli, actinomycetes and micromycetes. The increase of mineral nitrogen compounds in soil during the maturity phase to some extent inhibits the development of microorganisms, but not their mineralization activity.
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