EFFECT OF DIFFERENTIATED N FERTILIZATION ON THE MALTING USEFULLNESS OF BREWER?S BARLEY
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he aim of the study was to determine the effect of nitro-gen fertilization level of barley plants on the qualitative features of pilsner malt and congress wort, both used in the estimation of malting usefulness of barley grain. The research material ori-ginated from 2016 and 2017 growing seasons. The first group were the grains of three barley cultivars (Britney, KWS Dante, RGT Planet), originating from Post-registration Varietal Experi-mentation (PVE), fertilized with rates of nitrogen 50 kg ha-1 and 90 kg ha-1). The second group were the grains of three cultivars: Baryłka, Sanette and RGT Planet, originating from the Institute of Soil Science and Plant Cultivation- State Research Institute in Puławy. Integrated tillage consisted of inter alia plant fertilization with nitrogen at the dose of 100 kg ha-1 while intensive tillage involved nitrogen fertilization of 120 kg ha-1. The control gro-up was the Quench cultivar fertilized with N at 40 kg ha-1 level. The evaluation of malting usefulness of the grain was conducted according to the European Brewery Convention (EBC). It was stated that the effects of over-fertilization of barley plants with nitrogen occur at the rates exceeding 50 kgha-1 causing decre-ased extractivity of malts, lowered wort volume, too high solu-ble nitrogen content in wort, decreased final attenuation limit, and lowered mashhouse efficiency. The deteriorated wort featu-res occurred especially in treatments with fertilizer dose at 90–120 kg Nha-1.
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