Grape (Vitis vinifera L.) production and soil potassium forms in vineyard subjected to potassium fertilization

Abstract Potassium fertilization can change K forms available in the soil, as well influence plant absorption of it and yield but, mainly, affect grape composition. The aim current study was to investigate impact potassium (K) on production juice (must) composition a Cabernet Sauvignon cultivar. Grapevines were treated with 0, 50, 100, 150 200 kg ha-1 year-1 K2O. Leaf contents, per area, total soluble solids (TSS), must pH titratable acidity, soil assessed. Soil samples collected at 20-cm layer analyzed measure availability nonexchangeable them, based studies conducted over 3 growing seasons. Results have shown that application did not effect composition, although increased contents leaf blade petiole. However, annual fractionation has suggested 100 K2O is dose capable maintaining plants more appropriate throughout