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Melons: The Dessert of the Garden
Melons are generally rich in vitamin C and also contain moderate levels of Potassium, Vitamin A and Folate. While they are mostly consumed around the world as raw fruits, melons are known to be cooked, pickled and preserved. Chinese literature indicates that melons are used for cooling and as a diuretic. Melon aroma is due to the many volatile compounds, particularly alcohols, acids, and their esters formed during ripening. The amounts and ratios of these volatiles vary with the different C. melo groups, giving each its characteristic aroma and flavor. Extracts of melons are used as fragrances in cosmetics and for medicinal purposes. Melon seeds yield edible oils. Propagation: Melons can be either direct seeded for ease or transplanted to get a jump on the season. If direct seeding, direct sow in May or June after last frost when soil is warm, above 70°F (21°C), three or four seeds every two feet in rows at least four feet apart eventually thinning to one or two plants per spot. If transplanting, start seeds indoors two to four weeks before transplanting, sowing in individual pots at least two inches wide. Seedlings should be hardened-off for one week prior to transplanting by slightly restricting water and exposing them to the outdoors under partial shade. Cultural Techniques: Melons are vigorous growers and should be grown in rows as discussed above or in "hills" of 2-3 plants spaced at least 3 feet apart. Ripening fruits should be turned regularly to avoid couche (spots lacking proper skin color) and potential for rotting. Plant spacing can be reduced if vines are grown on trellises, but fruits should be supported by netting to keep them from falling. Any extra heat that can be provided through soil-warming mulches, windbreaks, or a sheltered site will generally result in a better outdoor crop, especially in cool climates. Slitted row covers over wire hoops make for excellent melon growing conditions however, the row covers need to be removed during the flowering stage to allow for insect pollination. Fertility: Melons require high nitrogen in the early stage of vine growth and require ample potassium and phosphorous in the flowering and fruiting stage, therefore applications of compost prior to harvest, sidedressing and/or foliar feeding during plant development are necessary. Feeding with Earth Juice Grow or Organic Gem Fish Fertilizer when vines are about 18 inches long and with Earth Juice Bloom during flowering, fruit set, and ripening stages will increase yields of ripe, flavorful fruit. Sandy soil is often preferred for melon growing, since it warms up more quickly and has sufficient drainage. Melons prefer moderately acid soils, (pH 6-6.5), but will generally tolerate soil pH ranges between 6-7.5 Irrigation: Good soil moisture is important in early stages of growth and during pollination when fruits are setting. After this point, restrict water unless the soil is very dry and leaves begin to show signs of wilting during the heat of the day. Melon plants abhor wet feet (waterlogging) and soil compaction, which severely limits root growth. Disease & Pests: Striped cucumber beetles are a primary pest of melons, especially early in the season. Besides damaging the plants physically, they can spread diseases such as bacterial wilt and mosaic virus. Cucumber beetles can be easily controlled by using fabric row covers or by applying botanical insecticides like rotenone and/or pyrethrin. Sulfur is often used as an organic fungicide for powdery mildew control but cultivars will vary in susceptibility to damage from sulfur applications. Susceptible plants will exhibit varying degrees of foliar burn. Apply according to directions to a small section of your planting before treating an entire crop. If the soil is infected with nematodes or Fusarium. Be sure to rotate your melons to a new area every year. Other deseases that can affect melons include: Alternaria leaf spot, curly top, downy mildew, cucumber wilt and scab. See the The Organic Gardeners Handbook of Natural Insect and Disease Control for information on identifying and controlling these problems. Harvest: Most melons mature within 80 to 120 days after planting. Melon ripeness is determined and/or defined by a complex interaction of sugar pH, texture, and volatile compounds. Most of their carbohydrates are sugars, not starch. The sweetness of the melon when you pick it is what you get - it doesn't get sweeter post-harvest. Melons start to ripen about 30 days after anthesis (flowering) and peak at about 42 days. Total sugars increase along with pH as melons ripen. Sweetness is noticeably missing in commercial melons picked unripe for shipping.Some rules of thumb for ideal harvest are:
Quality Evaluation: Total Soluble Solids (TSS) content of melon juice can be measured in degrees Brix with a handheld refractometer. Good quality melons generally have a TSS of 10% or more. Eating: Melons should be eaten when they begin to soften, but before they begin to break down. As a melon grows old, it loses flavor and ascorbic acid; it also develops stem-end cracks and water soaking of the flesh. Overripeness brings distasteful off-flavors and loss of color, sugars, and beta-carotene. A perfectly ripe melon is sweet, flavorful and nutritious. Storage: Cantaloupes and melons can be kept up to two weeks at around 45-50 °F (7-10°C) at high relative humidity 80 to 90%. Netted melons are best stored at slightly lower temperatures, 34-40 °F. (2-4 °C ) Studies conducted in Israel have shown that dipping melons in hot water at 125-130 °F (52-55°C) for 2 minutes can effectively control fungal rot. Table 1: Botanical variety classifications of cucumis melo fruit, Naudin 1859
References: Goldman, A. (2002) Melons, for the passionate grower. Artisan, A Division of Workman Publishing Company, Inc. NY, NY. Photo captions: (top)Melon tasting with Seeds of Change trial growers. (bottom) Eel River Melon
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