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Sweetness, fine texture, flavor, and juiciness are the factors that determine quality in cantaloupes.  Melons must be  mature at harvest to achieve these characteristics.  Cantaloupes do not increase their sugar content after harvesting as some fruits do, although they will soften and change their types of sugars.  A cantaloupe picked at the right maturity will be well netted or webbed and have a smooth rounded depressed scar at the stem..  This is called a full slip, because the stem has come off fully and smoothly when the melon was given a slight lift by the picker.  If the stem end is rough, the cantaloupe was not fully mature when picked and will not have the favorable characteristics of the full slip melon. Melons that are transported over long distances must be kept cold.  
Cantaloupes should be of adequate size, 5 inches or more, not small or runty, or misshapen.  They should not have cracks, be shriveled, flabby or badly bruised.  Melons showing any degree of decay, such as mold or soft sunken spots on the surface, should be rejected.  Melons should be left at room temperature until they take on a yellow background appearance, acquire aroma and soften.

Objective determination of quality based on measurements from U.C. Davis.  They consist of 14 different characteristics.  Ground spot diameter, measured in centimeters, elevation of net above the melon surface, judged visually; net tightness, that is, lateral development of spread of net strands; melon color, both background color and color of the net; unnetted suture width; size measured by melon cross the diameter; ratio of melon length to cross diameter, which indicates shape; net toughness as indicated by resistant of net to scraping by a knife blade held at 60 degree angle; melon firmness, as measured by instrument that makes a depression under a dead weight applied for a specified time at a point midway between the stem and blossom ends at about 90 degrees from the ground spot center; cavity diameter and outside cross diameter; ratio of thickness to cavity diameter; flesh firmness as measured by a Ballauf pressure fruit-tester; and concentration of soluble solids as measured by a hand refractometer.

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