Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Krasimir TRENDAFILOV, Mladen ALMALIEV

In condition of combined field experiment was studied the influence of liming with Ca(OH)₂ at rates of 1.0, 2.5 and 5.0t/ha on the input of nitrogen, phosphorus and potassium in the grapes of fertility vines from varieties Sauvignon Blanc, Chardonnay, Cabernet Sauvignon and Merlot planted on Chromic luvisol. Samples were collected in two consecutive years. At the variants with liming rates of 2.5 and 5.0 t/ha hydrated lime was found the average higher nitrogen content compared to the control variant, but the excess was more significant only at the rate of 2.5 t/ha, average for all participating varieties. Highest nitrogen content was found in the grapes of the varieties Chardonnay and Merlot, and the lowest - in Cabernet Sauvignon. Differences between the varieties for red and white wines were statistically proven regarding to the nitrogen content in the grapes. In the red wine varieties was found average about 70% of the nitrogen content in the white varieties. Liming with rates of 1.0 and 2.5 t/ha leads to logical and proven toward variation in there peats increase in the concentration of potassium in the foliage - respectively to 0.238% average for the rate of 1.0t/ha and 0.275% for the rate of 2.5 t/ha. When applied the rate of 5.0 t/ha lime material was found reduction of the potassium content and below the level of the control variant - up to 0.200%. The grapes in the white varieties contain proven more potassium compared to the red varieties, as the highest was average amount of potassium in the grapes of variety Sauvignon Blanc.

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