ANALYSIS OF POSSIBILITIES OF REDUCING THE QUANTITY OF MINERAL FERTILIZER APPLICATION USING DIFFERENT TYPES OF ORGANIC FERTILIZERS IN CARDINAL GRAPE VARIETY

This paper presents the results of a three-year study (2010–2012) on the influence of different types and combinations of fertilisers on the agro-biological, economic and technological characteristics of the Cardinal variety of grapes. The study was carried out in the experimental vineyard of the Biotechnical Faculty in Podgorica to explore the possibility of reducing the use of mineral fertilisers by applying various organic fertiliser sources. Ten variants of fertilisation were applied: control (500 kg ha^-1, NPK 8:16:24), cattle manure (25 t ha^-1), poultry manure (10 t ha^-1), peat (12 t ha^-1), combination of 75% mineral fertiliser and 25% cattle manure, combination of 75% mineral fertiliser and 25% poultry manure, combination of 75% mineral fertiliser and 25% peat, combination of 50% mineral fertiliser and 50% cattle fertiliser, combination of 50% mineral fertiliser and 50% poultry manure, and combination of 50% mineral fertiliser and 50% peat. The results demonstrate the possibility of using organic fertilisers to partially replace mineral fertilisers. The application of 50% mineral fertiliser and 50% organic fertilisers produced the best results in terms of grape yield and the physical and chemical characteristics of bunches and berries of the Cardinal variety..