questions: query regarding storage of potato.  
 answers: treat the seed with 30 gram of boric acid powder in 1 liter of water for 30 minutes. after that dry the seed in shade in a single layer for 2 days and then treat the potatoes again with any one fungicide like captan/captaf/ carboxin 4 gram per kg of seed. and then strore in banboo tray or basket in a cool, dry place air circulated area. also provide dry neem leaves in the trays/basket. 
for consumption purpose do not use the chemicals like boric acid and fungicide. only use dry neem leaves and mix  blackpeeper powder on the potatos for storage.