Soil samples were analyzed with the objective of investigating changes on some soil chemical properties due to NPK fertilization of 'Niagara Rosada' grapevine. The samples were collected in a field experiment carried out in Louveira, Brazil, during four crop seasons. The experimental design was an incomplete NPK factorial 1/2(4³). The treatments were rates of N (0, 65, 130, and 195 kg/ha of N as NH4NO3), P (0, 60, 120, and 180 kg/ha of P2O5 as triple superphosphate) and K (0, 45, 90, and 135 kg/ha of K2O as KCl) applied at each crop season. Nutrient (P, K, Ca and Mg) availability some chemical properties (organic matter, pH CaCl2, H+Al and base saturation) were evaluated through samples carried out in the experiment implantation (August, 2005) and after four production cycles (November, 2008). Soil samples were collected from layers of 0-20 cm and 20-40 cm. Fruit yield and some physical characteristics of bunches and berries were evaluated. Soil pH decreased with increasing in N rates. Low rates of P and K were sufficient to maintain soil P and K at the same concentration as found prior to the experiment. Grapevine production was not affected by NPK fertilization. The application of NPK fertilizers in vineyards with soils with high nutrient availability implies economic losses and environmental contamination risk.
soil analysis; grape; nitrogen; phosphorus; potassium
