Optimum Relative Humidity: 90-95%
Benefits of CA: Low O2 reduces the respiration rate. Elevated CO2 suppresses development of decay.
Benefits of Ethylene Removal: Blueberries are not sensitive to ethylene, nor do they produce appreciable amounts of ethylene. Ethylene removal confers no benefit.
Special Treatments Before Shipping: Rapid cooling to near 0°C before CA is established is important. Blueberry trays are sometimes shipped with plastic pallet covers to maintain a modified atmosphere. This also prevents moisture loss. Handling of blueberries should be minimized to prevent damage to the bloom (wax).
Varietal Differences: Although different kinds of blueberries are grown in the northern and southern US, the differences in tolerance to CA and optimal handling have not been documented. However, large differences in response to CA among different varieties is to be expected.
Mixed Loads: Keep cold. Can be shipped in mixed loads.
Cautions: Oxygen less than 1.5% can cause off-flavors. Carbon dioxide greater than 25% can cause skin browning and off-flavors.
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