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How to extend the watermelon fresh-keeping period
1, select the appropriate species. Thick and tough late-maturing varieties are generally used. 2, spray before spraying. About a week before the watermelon harvest, spray 70% thiophanate-methyl WP 800-1000 times. 3, harvest in advance to prevent injury melon. Melon takes 70% to 80% when it is ripe to harvest, choose sunny sunny harvest. Each watermelon has 10 to 15 cm long shoots, and the ends of the shoots are smashed with grass ash or lime powder. During picking and transport, care should be taken to prevent bumps, vibrations, and squeezing. 4, pharmaceutical disinfection. After picking it back, after the dew is dry, soak the watermelon in 15% salt water for 3 minutes to pick up. After drying, wipe the surface of the watermelon with 0.5%-1% potassium sorbate and seal it in polyethylene plastic. Bags. 5, into the cellar storage. Before entering the cellar, the cellar will be cleaned. Every cubic meter is fumigated with 10 grams of sulphur or sprayed with a 150-fold formalin solution. Closed for two days, the watermelon can enter the pit after ventilation. Cellar holes and skylights should be left in the cellar, ventilation and heat dissipation should be paid attention to during the storage period, the cellar temperature should be controlled between 5°C and 15°C, and the relative humidity should be kept between 60% and 80%. Ventilation and cooling can be used in the cellar when nighttime temperatures are low. Check every 10 days to remove the watermelon that should not be stored.