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acid amount apple trees applied apricot areas ASHS auxins bark Bartlett Bartlett pears bearing biennial bearing Bitter pit bloom blossoms branches brown brown rot bushels Calcium cyanamide carbohydrates cent cherry trees chlorosis citrus cold color cover crop crotch cultivation deficiency drop dwarfing early effect Elberta favorable feet flesh foliage fruit buds fruit set grafting growers growing hardy harvest heavy inches increase irrigation late leaf leaves limbs lower mahaleb maturity mazzard Mcintosh Mcintosh apples medium moisture mulch nectarine nitrogen fertilizer nursery nutrients occur peach trees pear trees period phosphorus picked planting plum pollination potassium pounds preharvest produce pruning quince reduced removal result ripening roots rootstocks scald season seed seedlings shoots soil management sour cherry sprays spring spurs Stayman storage sweet cherry thinning tion tissue trunk usually varieties vigorous Winesap winter injury wood Yellow yield