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`Newtown' apples (Malus domestics Borkh.) treated weekly with urea at 10 g·liter -l or Ca(NO 3 ) 2 at 7.5 g·liter -1 for 5 consecutive weeks from late August were greener at harvest and during storage than comparable control fruit. A postharvest dip in Nutri-Save, a polymeric coating, was better for retention of skin greenness than a dip in diphenylamine and both gave greener apples than control (nondipped) fruit. Fruit treated with Ca(NO 3 ) 2 displayed lesions that were larger and more numerous than typical bitter pit in the control fruit.
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M. Meheriuk (1990) studied this question.
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