Application of Sugar Foam to Vineyard Acid Soils under Mediterranean Conditions

Calcium (Ca) deficiency and aluminium (Al) toxicity are considered major chemical constraints that limitvine growth in vineyard acid soils under Mediterranean conditions. The main aim of this work was toevaluate the effects of three doses of sugar foam (900, 1 800 and 2 700 kg CaCO3/ha) on five soil properties(pH in water, Ca, Mg, K and Al exchangeable contents) and Ca concentrations in petioles and canes of onewine grape variety. Research was conducted over three seasons (2006 to 2008) in a random block design atLeón (Spain). The results for plants and soils were subjected to general lineal model analysis. As a result, onelinear model, validated through a cross-validation procedure, has been proposed to predict exchangeablecalcium levels in vineyard acid soils at véraison. Based on the results for the soils, the higher doses of sugarfoam (1 800 and 2 700 kg CaCO3/ha) were the most effective doses in decreasing Al exchangeable andincreasing Ca exchangeable contents. In addition, liming increased Ca content in petioles and decreasedCa content in canes, but in both cases these differences were not significant