Storage of seed is an essential part of a seed programme.
Storage duration and existing outside temperature determine which type of store is most relevant.
The main storage systems used are : Naturally ventilated stores, Diffuse light stores and Refrigerated stores.
Naturally ventilated stores
The temperature in the store can be kept at the average day / night temperature (T.av) if the structure is well ventilated and protected from the influence of the direct solar radiation. Depending on the existing outside temperatures potatoes can be kept for 4-6 months. Naturally ventilated stores are relatively inexpensive.
NATURAL VENTILATED STORES
Diffuse light stores
By allowing light to enter into naturally ventilated stores and by placing potatoes in thin layers the storage life of seed is prolonged.
DIFFUSE LIGHT STORES
In refrigerated stores, seed can be kept in good physiological conditions for up to 8.5 or 9 months. Refrigerated stores are needed in areas where there is only one growing season and where temperatures are high. (e.g. Pakistan Punjab, Bangladesh).
In areas with 2 production seasons and high temperatures, where naturally ventilated stores give satisfactory results. Refrigerated stores are used to give a seed programme more flexibility.
Refrigerated stores are expensive to establish and to operate (e.g. energy).
In many cases a cold store owner get his major income from potato trade rather than from renting cold storage space.