The experiment aimed to evaluate leaves nutrient content, yield and must composition in grapevines, which were submitted to the application to different forms of distribution of organic compost on the vineyard soil with Cabernet Sauvignon grapevine, grafted on 'Paulsen 1103' rootstock, at Udorthent soil, in the Southern Brazil, Bento Gonçalves city. The treatments were (T1) without organic compost; (T2) organic compost application with distribution on the soil surface, always at same side of the plant rows; (T3) organic compost application with distribution on alternate sides of the plant rows; (T4) organic compost application in holes always on the same side of the plant rows and (T5) organic compost application in holes on alternate sides of the plant rows. The weight of pruning was evaluated during winter and summer. Leaves were collected, oven-dried, weighted and total N, P, K, Ca and Mg contents were analyzed. In the harvest, the bunch number and weight, grape yield and pH, soluble solids, acidity, tartaric and malic acids in the must was evaluated. The compost distribution in holes always on the same side or in alternated sides of the plant rows, along of the years, increased the amount of dry matter of the branches pruned in the winter, especially, in the first years after your application. The application and forms of compost distribution in the soil surface or incorporated, annually on the same side of the rows or alternate sides of the plants, along the years, do not affected the yield grape, nutrient content of leaves and must composition. The organic compost should, when necessary, should be applied in the soil surface without incorporation, on the same side of the plant rows or on alternate sides of the plants row.
organic fertilization; mineral nutrition; Vitis vinifera; grape quality; Cabernet Sauvignon
