Detailed Explanation of Key Techniques for Spring Open-Field Cultivation of Loofah

 Loofah (scientific name: Luffa cylindrica), in the Pearl River Delta loofah specifically refers to the eight-angled gourd, is a plant of the Cucurbitaceae family native to India, also known as vegetable gourd, and is widely cultivated in East Asia. It cannot be eaten raw, and can also be used medicinally; it has cooling, diuretic, blood-activating, menstruation-promoting and detoxifying effects, as well as anti-allergy and beauty effects.

Growing Environment Requirements of Loofah

Light: Loofah is a short-day crop; it likes relatively strong sunlight and is fairly tolerant of weak light. During the seedling stage, treatment with short days and a large temperature difference favors female flower bud differentiation, allowing earlier fruiting and high yields. Throughout the whole growth period, shorter daylength and higher temperatures favor the growth and development of stems and leaves, can maintain robust vegetative growth, and are beneficial for flowering and fruit setting, young gourd development and increased yield.

Temperature: Loofah is a temperature-loving, heat-tolerant crop; the suitable temperature for loofah growth and development is 20-30°C, the suitable temperature for loofah seed germination is 28-30°C, and germination is rapid at 30-35°C.

Water: Loofah likes moisture and fears drought; it grows well when soil moisture is relatively high and water content is above 70%, and grows slowly when below 50%; air humidity should not be less than 60%. At 75%-85%, growth is fast and many gourds are set; when air humidity reaches saturation for a short time, it can still grow and develop normally.

Soil: Loofah is a vegetable crop with strong adaptability that is not strict about soil requirements; it can be cultivated in all types of soil. However, to obtain high yields, it is best to choose loam or sandy loam with a thick soil layer, high organic matter content, good aeration and strong water- and fertilizer-retention capacity.

Key Points for Spring Open-Field Cultivation of Loofah

Spring open-field cultivation of loofah is a traditional cultivation model; generally seedlings are raised in protective facilities (such as plastic sheds), and when air and soil temperatures are suitable they are transplanted to the field. Management is simple and returns are relatively high.

1. Variety requirements. Choose varieties with strong heat tolerance, strong resistance to viral disease, high yield and good quality, such as Cuiyu loofah, Jiangshu No. 1 loofah, Wuyexiang loofah, Shanghai Xiang loofah, etc.

2. Sowing and seedling raising. Raise seedlings in a greenhouse, generally sowing in mid-to-late March. Before sowing, prepare nutrient pots (filled with nutrient soil) or 72-cell trays (filled with gourd vegetable cultivation substrate). First soak the seeds in warm water at 50-55°C for 15 minutes, then when the water temperature drops to about 30°C soak for another 8 hours, then germinate them in an environment at 25-30°C, and sow when the sprouts are 0.5 cm long. First water each nutrient pot or tray cell thoroughly; after the water seeps in, place one sprouted seed flat inside, cover with 1 cm of soil, and cover with plastic film to keep warm and moist. After sowing, control the bed temperature at 25-30°C, and seedlings will emerge in about 1 week. At this point, ventilate to lower the temperature, keeping it at 25-28°C during the day and 15-18°C at night, to prevent leggy growth. Keep the pots or trays alternately dry and moist; do not water too much, to prevent root rot. Reduce the temperature 5-7 days before transplanting to harden the seedlings, keeping it at 20-25°C during the day and 13-15°C at night, and generally do not water.

3. Timely transplanting. Before transplanting, plow the soil deeply, apply 3000-5000 kg of decomposed organic fertilizer per mu, level the land and make beds; the bed width is 2.8-3 m and the bed ditch width is 0.6-0.7 m. The suitable seedling age for transplanting is 2 true leaves and 1 heart to 3 true leaves and 1 heart, generally transplanting in mid-to-late April. Plant one row on each side of the bed surface, with a plant spacing of 30-35 cm and 1200-1400 plants per mu. Immediately after transplanting, water to help the plants establish, lay the plastic film well, and punch holes to lead the seedlings outside the film.

4. Field management. After transplanting and seedling recovery, promptly apply diluted manure water to promote seedling growth; during the flowering and fruiting period, water frequently to keep the soil moist, generally watering once every 5-7 days. Every two weeks, apply 15 kg of ternary compound fertilizer per mu as a top dressing; during the harvest period, apply fertilizer once after every two harvests. When the vines are 30-40 cm long, set up trellises in time; generally a flat shed trellis is used, with a trellis height of 2 m, one shed per bed. Tie the vines onto the trellis in time, and remove all side branches below the first female flower; after the vines climb onto the trellis, generally no more side vines are removed. During the full fruiting period, remove old leaves, diseased leaves and excess male flowers and tendrils to facilitate ventilation and light penetration and reduce nutrient consumption.

5. Pest and disease control. Open-field cultivated loofah has strong resistance to pests and diseases; generally there are fewer diseases and no control is needed. However, when management is too extensive and the weather is dry, pests and diseases such as aphids, whiteflies and viral disease are likely to occur, and attention should be paid to their control.

6. Timely harvest. Harvest when the fruit is tender and the fuzz on the rind has decreased, once it has reached the harvest size for the variety.