Peas

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Infobox on Peas
Example of Peas
Peas.jpg
Freshness facts
Optimum carrying temperature 0°C to 1°C
Highest freezing point -0,6°C
Acceptable product temp. at loading into containers Max. 2°C above carrying temperature
Optimum humidity 95% to 100%
Ventilation setting for containers 25 m³/hr
Storage life 1-2 weeks
Climacteric / non-climacteric Non-climacteric
Ethylene production Very low
Ethylene sensitivity Medium
Modified / controlled atmosphere 2%-3% O2; 2%-3% CO2
Potential benefits Slight advantage
Availability
On demand

Harvesting and Handling

There are three types of edible peas. The most common is the garden or green pea. This pea has a tough pod, which is discarded prior to eating. Most often these peas are frozen or processed. The other two types of peas have soft, edible pods. The snow or sugar pea has a flat pod with minimal development of the seeds, whilst the sugar snap pea or snap pea has developed seeds and is fully rounded. The sugar snap pea is the result of a cross between the snow pea and an unusual tightly podded pea with thick walls.

Good quality peas should be uniformly bright green, fully turgid and free from defects and mechanical damage. Stems and calyxes should be green. Green peas lose sugars and flavour rapidly after harvest unless they are promptly cooled to 0°C. Film-packaging serves to minimise moisture loss, but the film must be sufficiently permeable to preclude the possibility of anaerobic respiration and resultant off-odours.

Cooling and Storage

All three types of peas can be stored for 1 to 2 weeks at 0°C with 95% to 98% RH. Garden peas store better unshelled than shelled, possibly because shelling damages the peas. If there is surface moisture on peas, it is essential that they be stored below 2°C.

Edible-pod peas are highly perishable and will not maintain good quality for more than 2 weeks. Wilting, yellowing of pods, loss of tenderness, development of starchiness and decay are likely to increase following storage beyond 14 days; defects occur faster at common distribution conditions of 5 to 10°C. Peas are not sensitive to low temperature and should be stored as close to 0°C as possible without freezing.

Controlled atmosphere considerations

Reports vary widely in the benefit of CA for sugar and snap peas. Atmospheres of 2% to 3% O2 and 2% to 3% CO2 are considered to offer the best, but moderate, benefit to peas beyond that of rapid cooling and proper storage. Low O2 may promote off-flavours and off-odours.

Peas are moderately sensitive to exogenous ethylene. Accelerated yellowing and decay will result from extended exposure to low levels of ethylene during distribution and short-term storage. The calyx is more sensitive to ethylene than the pod.

Storage disorders

Anthracnose, Asochyta pod spot, Bacterial soft rot, Blight, Powdery mildew, Watery soft rot, Wilting.