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Controlled atmosphere (CA) storage for 30 or 60 days reduced quality losses for 'Jonagold', 'Golden Delicious', 'Delicious', 'Granny Smith', and 'Fuji' apples ( Malus domestica Borkh.). After 30 days 'Jonagold' and 'Golden Delicious' from CA were firmer, had higher acidity, and were less yellow (more green) than apples from regular atmosphere (RA) storage. 'Delicious' and 'Granny Smith' were firmer after 60 days of CA storage than fruit from RA. In addition, 'Granny Smith' from CA had more acid and were greener than apples from RA. After 8 days of ambient storage, little loss in firmness and no loss in acid content occurred with 'Jonagold' or 'Golden Delicious' from CA compared to the significant loss in firmness and acid when stored in RA. After ambient storage for 8 days, 'Jonagold', 'Golden Delicious', and 'Granny Smith' retained a freshly harvested apple color with more green and less yellow development when stored in CA rather than RA. In 'Fuji', the treatments had no effect except for improved acid retention if stored in CA. A combination of 30 days CA followed by 30 days RA produced 'Jonagold', 'Golden Delicious', and 'Delicious' that were superior in quality to apples from 60 days RA. Present controlled atmosphere (CA) storage in Washington State (WAC, 1989), established in 1964, requires that before fruit can be certified as CA, apples must be stored for 90 days at 5% O 2 or less, and the O2, requirement must be met within 20 days after the room is sealed. Since these requirements were established, tech- nology has advanced and CA conditions can be at 1% O 2 in a matter of hours. There is no doubt that long-term storage in CA has enhanced the dessert quality of apples (Lidster et al., 1980; Mattheis and Olsen, 1989; Meheriuk, 1991; Meheriuk and Pruitt, 1973; Meheriuk, et al., 1984; Patterson and Nichols, 1988; Patterson and Workman, 1962; Olsen, 1969; Olsen and Schemer, 1964). If new technology of establishing very low O2 levels quickly is taken into consideration, there is good reason to believe that early storage quality advantages would be present. Some research (Couey and Olsen, 1975; Lau and Looney, 1978; Olsen and Barnum, 1978; Wang and Mellenthin, 1975) has been concerned with short-term changes in CA atmospheres, but after this short period of time, normal CA patterns were established for long-term storage. No research has been conducted on apple response to short-term (60 days or less) CA storage. with a computer-contr olled system (Technical Consulting Ser- vices, Chelan, Wash.). Nitrogen was supplied by a Generon Membrane Separation System (Generon, Houston). After 30 and 60 days of storage, apples were removed and quality comparisons made between RA and CA storage. A portion of the fruit was removed after 30 days from CA and stored an additional 30 days under RA. Fruit that had received a combination of CA and RA (30/ 30) storage were compared with fruit from 60 days of RA or CA storage alone. Analysis of 'Jonagold', 'Golden Delicious', 'Deli- cious', and 'Fuji' was determined immediately after removal from storage and after 8 days ambient temperature ( ≈ 21 C) storage and after 10 days ambient storage for 'Granny Smith'. Twenty fruit (storage type/storage time/rep) were used for quality analysis.

Short-term Controlled Atmosphere Storage Improved Quality of Several Apple Cultivars