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abscission Agricultural appear apple application breeding canopy cause changes characteristics cherry Citrus combinations concentration CONGRESS considerably countries crops cultivars cultivation culture density dependent determined early effect experiments factors farms fertilizers field flower fruit fruit growing fruit production fruit trees gene genetic growing growth harvesting higher Hort HORTICULTURAL hybrid important improved increase industry influence initiation intensive INTERNATIONAL irrigation Italy later leaf length machine maturity means mechanical mechanical harvesting methods natural needed nutrient obtained occur orchards peaches pears pepper period plants plastic possible potential practice present problems processing production pruning range reduced relative resistance root rootstock scion seed seedlings selection shoots soil species stage standards Table temperature tomato treatment trees unit varieties various vegetable winter yield