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abscission agricultural apple fruits apple scab apple trees application auxin biennial bearing bloom breeders breeding canopy chemical Citrus clones concentration CONGRESS WARSZAWA 11-18 crops cultivars cultivation cytokinins density DNOC dormancy drip irrigation effect factors farms fertilizers flavor flower initiation fruit growing fruit production fruit set fruit trees gene genetic germination gibberellin Golden Delicious grapes greenhouses growers grown herbicides Hort HORTICULTURAL HORTICULTURAL CONGRESS WARSZAWA important increase industry inflorescences INTERNATIONAL HORTICULTURAL CONGRESS irrigation kohlrabi leaf lettuce maturity mechanical harvesting melon methods monoecious non-cultivated nutrient nutrition obtained orchards parthenocarpic peaches pears pepper pollination potential problems Proc processing pruning resistance root rootstock scion seed production seedlings SEPTEMBER 1974 shoots soil sour cherry species strawberries Table temperature tissue tomato treatment varieties vegetable WARSZAWA 11-18 SEPTEMBER XlXth INTERNATIONAL HORTICULTURAL yield