Mango Post-Harvest Standard Operating Procedures

This SOP treats post-harvest mango loss as equivalent to a regenerative failure: wasting a mature mango wastes all the water, carbon, and biological energy invested in producing it. Structured as a direct response to a grower question raised in a PQNK WhatsApp learning group, it walks through 19 numbered decision points from pre-harvest maturity checks to final ripeness assessment, each stated as a yes/no field question with the reasoning behind the answer.

Pre-harvest and harvest guidance is built on specific, checkable signals rather than general rules: maturity is confirmed by slightly yellowish flesh when cut, sinking of the stalk area, and variety-specific days-from-flowering (Sindhri at roughly 100-110 days), and irrigation is stopped 10-15 days before harvest to raise sugar content and reduce sap and rot risk. Harvesting is done in the cool of early morning or late evening, never in afternoon heat, with fruit cut with a 2-3 cm stalk using sharp secateurs rather than plucked, since a torn shoulder from plucking is a direct fungal entry point, and cut fruit is held stem-down immediately to keep latex off the skin and prevent lenticel damage (black spots).

The ripening protocol specifies exact physical parameters: boxes are semi-ventilated with 3-5 mm holes (never airtight, which produces anaerobic off-smell and rot), straw layering is capped at 3 layers with total box height under 30 cm, and small-batch natural ripening uses a ratio of 1 ripe banana or 2 ripe mangoes per 10 mature mangoes in a closed but vented box. Onion or mustard as ripening aids are flagged explicitly as a myth, since they emit sulfur compounds rather than ethylene and can taint flavor. Ideal ripening conditions are held at 22-27°C and 75-85% humidity, with fruit elevated 2 inches off the floor on a jute-sack-then-straw base to avoid cold-tile condensation, and boxes opened for 10 minutes daily to exchange humid air.

The paper closes by naming the three most common causes of rot rather than proper ripening: plucking instead of cutting (fungal entry within 48 hours), washing before ripening (trapped residual water causing soft rot), and stacking more than 4 layers deep without straw (heat and moisture buildup with no airflow). It also scores three ripening methods against PQNK acceptability: natural straw-and-banana ripening (5-8 days, accepted, best taste and texture), commercial ethylene gas (rejected as not pristine, uniform but flavorless), and calcium carbide (rejected outright as illegal, toxic, and damaging). Properly handled fruit is stated to hold 5-10 days of shelf life at room temperature once ripe.