Leaf nitrogen application is used in grapevines in Southern Brazil as complement to soil fertilization. On the other hand, there is no information about its affects on nitrogen content in the leaves and nitrogen and carbohydrates reserves in the perennial parts. The experiment was carried out in 2004/2005, with the objective to evaluate the effect of nitrogen foliar spraying on leaves and nitrogen and carbohydrates reserves in shoots buds of Chenin Blanc grapevine, at Udorthent soil, in Bento Gonçalves, Rio Grande do Sul, Brazil. The treatment was three foliar applications: 0 (water); 1.11; 2.23; 3.31; 4.41g N grapevine-1. Leaves were picked, dried and prepared to total nitrogen analyses. In the last leaf sampling, three shoots and six buds were taken in each plant, prepared and analyzed for starch, total soluble carbohydrates, carbohydrates reducers, total amino acids and total proteins. Leaf nitrogen application increased nitrogen content in the leaf and decreased starch content and total soluble carbohydrates in shoots buds, but did not affect carbohydrates reducers and totals of aminoacids and proteins.
Vitis Vinifera; foliar fertilization; starch; aminoacids; proteins
