Onion production
Because onions get diseases often grown in rainy season, raising beds and proper spacing keep plants healthy and long maturing onion varieties in small amounts and always raise beds higher when growing onions in rainy seasons than during season.
Similarly, dry out onions in field before harvesting and dry out harvested onions for a few days before storage and store onions in a well cool ventilated place.
Finally, transport onions to market for more prices.