Effect of girdling, K foliar sprays and shoot pinching on Banati, Thomposon seedless grapevines .1 .- yield, fruit quality and leaf macro-elements content

abonos potasicos application foliaire calidad chemical composition composition chimique contenido mineral despunte engrais potassique foliar application mineral content pincement pinching potash fertilizers quality rendement rendimiento stems tallo tige vitis vinifera yields