Agriculturae Conspectus Scientificus, Vol 66, No 4 (2001)

Fertilization of cv. Plavac mali (Vitis vinifera L.), Yield and Must Quality


Pages: 195-201


In order to determine optimal fertilisation (timing, nutrients and quantity of fertiliser) and their influence on yield and quality of the cv. Plavac mali (V. vinifera L.), an experiment has been carried out in the karst conditions of Blatsko polje on the island of Korèula. The trial included five variants of fertilisation in five repetitions. The variants were as follows:
K - without fertilisation; A - NPK (7:14:21) 500 kg/ha in autumn;
B - NPK (7:14:21) 500 kg/ha in autumn + 100 kg superphosphate (16%);
C - NPK (7:14:21) 500 kg/ha in spring + 100 kg superphosphate (16%);
D - NPK (7:14:21) 500 kg/ha in spring + 100 kg superphosphate (16%) + KAN (27%) 100 kg/ha.
In the ten years trial (1988-1997) the highest average yield per vine has been obtained in variant D (2,16 kg) and the lowest in the variant K (1,59 kg). Average sugar content of 16,52% and 16,55% has been measured in variants K and A, somewhat lower in variants B and C (16,44% and 16,26%) and the lowest in variant D (15,84%). Slightly increasing in total acidity has been shown from variant K (5,99 g/l) to variant D (6,59 g/l). The above-presented results show a positive effect of fertilisation on the yield and quality of Plavac mali grapes during the investigation period. Regarding the time of fertiliser application, this experiment proved that the spring fertilisation of vineyards is the most suitable for karst field condition, because of high level of underground water during the wintertime.


fertilization; cv.Plavac mali; quality; Vitis vinifera L.; yield

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