It is very important for the grower to know the factors that affect long-term storage capacity, from production planning to harvesting techniques. Adequate handling and storage capacity is very important as it helps to ensure the supply of onions to meet consumer demand. When storing onions, it is important to understand growth physiology for easier regulation of growth regulators. The success of storage depends on the conditions under which the onions grow (agrotechnical measures). Optimal storage conditions can further prolong the quality of onions if some conditions are observed. These include timely harvesting, proper handling at harvest, and adequate care during the growing season through proper irrigation, fertilization, and chemical protection. Studies have shown that over-irrigation at the stage when the bulb neck closes leads to rot during storage, while lack of water leads to lower yields, earlier germination and greater water loss. Controlled storage conditions that allow long storage, such as low temperature and medium to high relative humidity in the warehouse, are required. The main quality loss of onions during storage is due to water loss, germination, rooting, and changes in the chemical composition of the onion. Quality has been reported to decrease under anaerobic conditions due to lower sugar content and lower onion firmness.
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