INVESTIGATION OF THE INFLUENCE OF MINERAL NITROGEN FERTILIZERS ON THE MICROBIOLOGICAL AND ENZYMIC ACTIVITY OF SOILS WITH RAPESEED

Boyka Malcheva, Pavlina Naskova, Dragomir Plamenov

Abstract


The use of easily digestible and fast-acting mineral fertilizers, in effective combinations and fertilizer standards, suitable time and duration of fertilization, improves soil fertility, quality and yield of agricultural production. The purpose of this experimental work is to investigate the influence of mineral nitrogen fertilizers - products of Agropolychim AD (variant with liquid nitrogen fertilizer UAN and variant using urea and ammonium nitrate) on soil microflora in the rapeseed rhizosphere and the enzymatic activity of fertilized soils. Higher biogenicity of the studied soils than Urea + ammonium nitrate was found upon the introduction of UAN. Fertilization with urea + ammonium nitrate, however, increases soil mineralization activity against UANs and untreated controls. Both fertilizer variants have been found to increase the activity of cellulase and catalase enzymes. The analyzed microbiological and enzymatic parameters can serve as sensitive biological and biochemical markers for establishing the influence of fertilization with nitrogen mineral fertilizers on the amount, composition and activity of soil microbiocenosis, as a key factor in improving soil fertility.


Keywords


rapeseed, mineral nitrogen fertilizers, soil microflora, catalase, cellulase

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References


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New knowledge Journal of science is financed by the National Science Fund of the Republic of Bulgaria  in the competition of Bulgarian scientific periodicals – 2019

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