Overview
ISO 1212:1995 - "Apples - Cold storage" provides guidance on the successful cold storage of apples (Malus communis L.). This second edition updates the original standard and gives practical, general-purpose recommendations on harvest maturity, precooling, packing, air and temperature control, controlled-atmosphere storage, and measures to reduce post‑harvest wastage. The standard is advisory - local cultivar, climate and handling conditions determine exact practice.
Key topics and technical requirements
- Harvest maturity criteria: guidance on assessing readiness for harvest using ease of picking, total soluble solids (TSS), ground colour, days from full bloom, flesh firmness and starch presence. Fruit should be placed into storage at or before the preclimacteric respiratory minimum for best results.
- Quality classes: classification into Extra, Class I and Class II (referencing UN‑ECE FFV‑01) with characteristic limits for defects, shape and sizing.
- Precooling and packing: rapid removal of field heat is essential. Packages must allow free air circulation; recommended storage densities are about 200–250 kg/m³ usable space. Box pallets can increase capacity by 10–20%.
- Temperature control: optimum storage temperatures vary by cultivar. General guidance: around −1 °C to 0 °C for many cultivars; 2–4 °C for chill‑sensitive varieties. The highest freezing point cited is about −1.5 °C.
- Relative humidity and airflow: maintain 90–95% RH to minimize shrivel for susceptible cultivars. Design air-flow around stacked containers at 0.25–0.35 m/s and provide at least 7.5 air changes per hour in the empty room volume.
- Controlled-atmosphere (CA) storage: recommended CA ranges are typically O2 ~1.5–3% and CO2 ~1–3%, with cultivar-specific mixes and temperatures listed in the standard (Table 2).
- Alternative methods: use of food-contact plastic liners or coverings can reduce mass loss; careful sanitation, sorting and orchard management reduce post-harvest diseases and physiological disorders.
- Post-harvest disorders: identification and prevention guidance for disorders such as internal low‑temperature browning, scald, bitter pit, core browning and senescent breakdown; remedial measures include temperature management, calcium/boron treatments and ventilation.
Practical applications
- Use ISO 1212 to design and validate cold storage protocols for apples in packhouses and cold stores.
- Apply its recommendations when selecting harvest timing, precooling methods and packaging to extend shelf life and reduce shrink.
- Incorporate CA guidance for long‑term storage of susceptible cultivars (e.g., Golden Delicious, Jonathan, Granny Smith).
- Use the standard as a reference for post‑harvest training, quality control, and specification writing for cold‑chain logistics.
Who should use this standard
- Apple growers and orchard managers
- Packhouse operators and cold‑store managers
- Post‑harvest technologists and quality assurance teams
- Cold‑chain logistics planners and produce retailers
- Agricultural extension services and regulators
Related standards
- ISO 2169:1981 - fruits and vegetables - physical conditions for cold stores (definitions and measurement)
- UN‑ECE Standard No. FFV‑01 - classification criteria for dessert and culinary apples and pears
Keywords: ISO 1212:1995, apples cold storage, cold storage of apples, controlled‑atmosphere storage, storage temperature, relative humidity, post‑harvest disorders, apple packing.