Mechanical pruning and soil organic amendments in vineyards of ‘Syrah’: effects on wine mineral composition

The interaction of mechanized pruning systems and soil organic amendment can affect vine vegetative reproductive growth. However, since amendments supply several mineral elements, namely heavy metals, this study aimed to understand the effects between these two practices on composition wine. Two field trials were implemented in ‘Syrah’ vineyards Portuguese wine regions (Lisboa Tejo). Mechanical hedge was compared with hand spur four different tested: biochar, municipal solid waste compost, cattle manure sewage sludge. nitrogen (N), phosphorus (P) potassium (K) contents significantly reduced by mechanical while calcium (Ca) magnesium (Mg) tendentially higher system. also content some minor such as arsenic (As), molybdenum (Mo) nickel (Ni). In 2014, year growth, other elements decreased a consequence (gallium - Ga; lithium – Li; rubidium Rb, thallium Tl; yttrium Y). Concerning amendments, sludge associated wines lowest P iron (Fe) content. Ca compost treatments. had wine, according each specific element. legal limits, recommended OIV established European Union, well technical adopted winemakers, never exceeded both does not seem be problem what concerns produced wines.