Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 2
Written by Tomislav KARAŽIJA, Mihaela ŠATVAR, Tihana KEŠER, Sanja SLUNJSKI, Boris LAZAREVIĆ, Marko PETEK
Growing grapevines on calcareous soils often leads to plant nutrition dissorders. Vineyard fertilization practices on such soils differ significantly from the fertilization on acid soils because of influence of free calcium and high pH on the availability of nutrients.Three year trial was set up according to randomize complete block design with 6 treatments (unfertilized, farmyard manure 20 t ha-1 and 40 t ha-1 , peat 20 000 L ha-1 and 40 000 L ha-1 , NPK (5-20-30 500 kg ha-1 +200 kg UREA kg ha-1) in 4 repetitions. Samples of grapevine leaves were taken three times during the growing period: at the flowering, two weeks after flowering and at the veraison. Total nitrogen was determined by the modified Kjeldahl method, phosphorus was determined spectrophotometrically, potassium flamephotometricaly and calcium and magnesium atomic absorption spectrometricaly. Significant effect of fertilization was determined in the first year of the study on the amount of calcium (two weeks after flowering) and in the third year on the amount of potassium (flowering). Fertilization did not significantly affect the amount of nitrogen, phosphorus and magnesium in grapevine leaves.
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