engleski

Phosphorus dynamics in grapevine on acid and calcareous soils

Influence of soil reaction on phosphorus content and dynamics in grapevine (Vitis vinifera c.) was investigated on the variety Sauvignon blanc in the Plešivica wine-growing region (North-western Croatia) in 2007. The trial was set up on three vitisol subtypes: dystric cambisol (pH KCl 3.75), pseudogley (pH KCl 4.68) and rendzina on marl (pH KCl 7.25). Equal fertilization and vine protection were applied in all three vineyards. To determine the level and dynamics of phosphorus in plant material, leaf samples were taken three times in the course of the growing period: at the flowering and veraison stages and at the end of the growing period. Statistical methods used in the present study included correlation and regression/analysis of variance. Regression analysis revealed that vine leaf phosphorus content increases with increasing the soil reaction pH ; it starts with 0.02% for each pH unit at the flowering stage and reaches the value of 0.11% at harvest. At all samplings, higher leaf phosphorus contents were found in calcareous soil compared to acid soil. Phosphorus concentrations at the veraison stage were 2 times and at the end of the growing period even 3 times higher in leaves of plants grown on rendzina compared to plants grown on dystric cambisol. These differences may be attributed to better solubility of calcium phosphates in calcareous soils compared to aluminium and iron phosphates in acid soils. Differences in sugar and acid concentrations in must indicate a positive correlation between concentrations of leaf phosphorus and must sugar (R=0.90) and negative correlation between the leaf concentration of phosphorus and must content of acids (R= - 0.89).

grapevine; phosphorus; soil reaction; leaf; must

Rad je prezentiran na skupu VII. Alps-Adria Scientific Workshop, održanom od 28.04.-02.05.2008.g., Stara Lesna, Slovačka.