Influence of liming with Ca(OH)2 on nitrogen, phosphorus and potassium content in foliage of vine varieties

K. Trendafilov, V. Valcheva, S. Todorova
Abstract. In conditions of combined field experiment the influence of liming with Ca(OH) was studied in rates of 1,0, 2,5 and 5,0 t/ha on the input of nitrogen, 2 phosphorus and potassium in the leaves of fertility vines from varieties Sauvignon Blanc, Chardonnay, Cabernet Sauvignon and Merlot, planted on Chromic luvisol. Samples were collected in three consecutive years; the first sampling time is 15 months after the incorporation of lime into the soil and the second and third – at intervals of 12 months. Nitrogen content in foliage established in all measurements from first sampling of leaves showed no significant differences between the variants. In subsequent years higher nitrogen content was found in the leaves of all varieties and the excess, compared to the first year is best expressed in the red varieties, mainly in Merlot variety. There are significant differences between varieties in relation to phosphorus content in air-dried leaves. There is a trend to increase the absorption of phosphorus when applying meliorative lime rates of 1,0 and 2,5 t/ha, while the rate of 5,0 t/ha inhibits the accumulation of phosphorus in leaves.As regards the absorption of potassium similar patterns were found as for phosphorus. No significant difference between the content of potassium in the three consecutive years of sampling was found. Differences in absorption of potassium between the red and white wine varieties are more clearly pronounced than the differences between varieties in relation to content of phosphorus and nitrogen.