K. Trendafilov, V. Valcheva
Abstract. In conditions of combined field experiment the influence of liming with Ca(OH) in rates of 1,0, 2,5 and 5,0 t/ha on the input of nitrogen, phosphorus 2 and potassium in the leaves of fertility vines from varieties Sauvignon Blanc, Chardonnay, Cabernet Sauvignon and Merlot, planted on Chromic luvisol was studied. 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. The highest content of iron is absorbed by the Cabernet Sauvignon – the average for all variants for this variety exceeds by nearly 50% the iron adsorbed by Sauvignon Blanc and by 40% – by Merlot variety. The relationship between iron absorption and rate of applied lime appears relatively clear at high lime rates – 2,5 and 5,0 t/ha. For Merlot variety the opposite trend is found – liming increased iron content in foliage, and this tendency is stable and keeps over the entire period of our study. Relatively great extent of decrease in the amount of assimilated iron was found at rate of 2,5 t/ha hydrated lime. The manganese is absorbed more intensely in the leaves of white wine varieties, and especially in those of Sauvignon Blanc. The lowest manganese content is found in leaves of Merlot variety. Liming of soil in terms of this field experiment causes a statistically proven increase in the manganese content in foliage of wine grape varieties, included in this study.