Mastering Watermelon Cultivation: Keys to Quality and Success

Watermelons, being emblematic of summer crops, demand meticulous care to attain top-notch quality. Achieving the coveted red, juicy, and crisp varieties requires undivided attention. A key challenge in watermelon farming lies in gauging ripeness and quality without tasting, as external appearance often belies the true state of the flesh within. This task calls for the expertise of seasoned professionals adept at discerning subtle indicators of maturity and excellence.

Thriving in warm, extended seasons, watermelons flourish best in well-drained sandy loam soils with a slightly acidic pH. With proper fertilization, sandy soils can yield exceptional watermelon crops. While these fruits tolerate pH levels as low as 5.5, their optimal growth occurs within the 6.0 to 7.0 range. Treating acidic soils with lime can enhance their suitability for watermelon cultivation. Soil preparation before planting entails labor-intensive tasks like plowing, disking, and sub-soiling to encourage deep rooting in compacted layers.

Wind protection is pivotal in watermelon farming, as young plants are susceptible to wind damage. Implementing windbreaks, using crops like wheat, rye, or hybrid Sudan grass, is crucial. As watermelon vines sprawl, windbreak crops are managed accordingly, leaving a narrow strip standing for continued protection, albeit with measures to minimize competition.

From planting to harvest maturity, typically spanning five to six weeks post-pollination, different watermelon varieties exhibit varying characteristics denoting maturity levels. Seasoned farmers often discern ripe watermelons by their glossy rinds, alongside the telltale shift in ground spot color from white to light yellow.

Recent advancements in agricultural tech have revolutionized watermelon cultivation. Precision farming techniques, including soil moisture sensors and automated irrigation systems, optimize water usage, enhancing both yield and quality. Additionally, research into disease-resistant varieties and integrated pest management has curbed the impact of common watermelon pests and diseases, ensuring healthier crops.

In essence, cultivating premium watermelons entails meticulous attention to soil prep, plant protection, and maturity assessment. With skilled hands and modern agri-tech at their disposal, farmers can deliver watermelons that enthrall consumers with their sweetness and crispness, cementing their status as summer staples.
Mastering Watermelon Cultivation: Keys to Quality and Success

Watermelon post-harvest

Watermelons in most of the world are customarily handled postharvest under nonrefrigerated conditions. Shelf life for watermelon is 2–3 weeks at 10–15C depending on cultivar.

Watermelons should be harvested at full maturity to ensure that good quality fruit are delivered to the market. The fruit do not develop internal color or increase in sugar content after being removed from the vine. Harvesting usually begins 3-4 months after planting.

The ground spot (the portion of the melon resting on the soil) changes from pale white to a creamy yellow at the proper harvest maturity. The ground spot color is easily revealed by gently rolling the fruit over to one side while still attached to the vine. Also, tendrils near fruit stem have changed color from green to brown.

Very experienced workers can determine ripeness stage based on the sound produced when the fruit is thumped or rapped with the knuckles. Immature fruit will give off a metallic ringing sound whereas mature fruit will sound dull or hollow.

Sugar content (measured as soluble solids by use of hand held refractometer) of 10 % or more in the flesh near the center of the melon.

Lycopene content peaked 7 days postharvest and intensity of flesh color increased concomitantly; yellowing of flesh was detected at 14 days.

Rootstocks improved postharvest flesh firmness and lycopene content and enhanced flesh color. Rind was minimally thickened by rootstocks and declined with storage.

The harvest operation is a manual process which is the most labor-intensive part of producing watermelons. Due to their large size and susceptibility to splitting or cracking under mechanical stress, watermelons should not be harvested in the early morning when they are most turgid.

Handling should minimize fruit injury which may be caused by impact or abrasion. Shading is necessary in order to protect watermelon from direct sunlight which causes sunburn.
Watermelon post-harvest

Cultivation of watermelon

Watermelon is now widespread in all tropical and subtropical regions of the world and is mostly grown for fresh consumption of the juicy and sweet flesh of mature fruit. Watermelons require long, warm growing periods. Bright, hot days (27 – 35°C) and warm nights (16-21°C).

Watermelon is propagated by seed. In general, seed rate of 2-3 kg/ha for small-seeded type and 4-5 kg/ha for large seeded type is sufficient.

Watermelons grow best on non-saline sandy loam or silt loam soils. Light-textured fields warm up faster in the spring and are therefore favoured for early production.

Fine sands produce the highest quality melons when adequate fertilizer and water are provided. Windbreaks are advisable on sandy soils to reduce “sand blast” damage and stunting of young seedlings caused by spring winds.

Water deficits during the establishment of watermelons delay maturity and may cause gaps in production. Water stress in the early vegetative stage results in reduced leaf area and reduced yield. Sandy soils may require more frequent, lighter applications than heavier soils to prevent moisture stress. Irrigate the field before dibbling the seeds and thereafter once a week. Irrigation should be given at regular intervals of time. Irrigation after a long dry spell results in cracking of fruit.

Days to maturity: It is usually 80 to 90 days for baby bush varieties and 90 to 100 days or more for the larger varieties.
Cultivation of watermelon

Harvesting watermelon

Harvests generally begin about 30 days after full bloom and continue for several weeks with 3 to 4 cuttings at 3 to 5 day intervals.

Harvesting watermelon at the right time takes some practice and knowledge of what size chosen cultivar should be when ripe.

Ripeness in watermelon is difficult to determine because the fruit remains attached to the vine, rather than ‘slipping’ off.

The most common way by which people traditionally determine watermelon ripeness includes knocking on the fruits and to assess the ripeness using the reflected sound. The flesh of a typical-fleshed watermelon changes from immature pink to red-ripe, and then to overripe within a 10 to 14 day harvest window.

Overripe fruits have a watery mushy texture and lower sugar. Ripe fruits are cut from the vine, leaving a 1-2 in stem. A field is harvested 2 to 6 times by hand at weekly intervals, depending on watermelon price, density of plants, and quality of plants.

Harvested fruits are lifted from the field by hand. They may be tossed from person to person down a row until placed in a truck bed or onto a conveyor belt system and conveyed to trucks.
Harvesting watermelon

Ideal soil for watermelon

Watermelon is a productive garden crop. Aside from being a table fruit, young watermelons can be cooked in the same manner gourds are cooked.

Watermelon is a warm-season, frost-sensitive crop that requires a relatively long growing season from 75 to 120 days depending on the cultivar and environment. The plant is best grown in the month of October to January; however, in the upland and on hillsides, watermelon can be grown during the rainy months.

Watermelon can be grown on a variety of soil types. Ideal soil for watermelon is well-drained, fertile, light soil, which is enriched with manure or compost with pH range from 6.0 to 7.0.

Soil compaction restricts root growth, so friable, deep and well drained sandy loams are preferred for watermelon production.

In the lowland, sandy-loam and silly-loam are ideal soils for watermelon. In the hillsides and upland, sandy and stony soils will produce quality harvest of watermelon when these are enriched with organic matter.

Watermelons can be grown without irrigation or mulch but this is not recommended for commercial production because most areas experience water deficits sometime during the growing season that lower yields and reduce fruit quality.

Continuous cropping of the same land should be avoided. Rotation once every 4-6 years is desirable and once every 10 or more years of Fusarium and nematodes are a problem.
Ideal soil for watermelon

Watermelon Harvesting and Handling

Watermelon Harvesting and Handling
Watermelons are summer crops that need effective handling for quality production. To produce the red, juicy, crispy variety of melons, special care and attention is obligatory. To determine the quality and ripeness of watermelons without tasting is not an easy task as external color or appearance does not actually reveal the quality of the flesh inside. This task of determining the quality of watermelons without tasting requires the aid of a skillful hand.

Watermelons are warm, long season crops and grow best on well-drained sandy loam soils with slight acid. Sandy soils with adequate fertilizers yield very fine quality watermelons. Watermelon is fairly tolerant to soil pH as low as 5.5. Watermelon grows best where soil pH is between 6.0 and 7.0. Application of lime to a low pH soil can yield better results. Before planting the seeds of watermelons, much labor is invested to prepare the soil. In addition to plowing and disking, sub soiling beneath the row promotes deeper rooting in soils having a compacted layer. In case of strong winds, windbreaks of fall-planted wheat or rye or spring-planted hybrid Sudan helps to provide some protection to young plants. The windbreak crop between the rows is cultivated or disked out as the watermelon vines begin to run. A narrow windbreak strip can be left standing between rows for wind protection later in the season, but it should be undercut or killed with chemicals to reduce competition with the watermelon crop.

Depending on variety and season, watermelons reach harvest maturity five to six weeks after pollination. Different varieties of watermelons carry different characteristics, thus indicating different levels of maturity. Experts on the field can easily identify a ripe melon just by glancing at its glossy rind surface. Other indications of ripeness include a change in the color of the ground spot from white to light yellow.
Watermelon Harvesting and Handling