A Detailed Guide to the Cultivation Techniques and Field Management of Bitter Gourd (Momordica charantia)

Bitter gourd is a relatively small fruit that turns red when ripe; when peeled open, it contains many seeds, and this part is not edible. The surface of the bitter gourd has many uneven bumps and does not look particularly attractive, but its uses and benefits are very numerous, and it is now increasingly favored by consumers.

Cultivation Techniques for Bitter Gourd

1. Field preparation. After the field has been sun-dried and subjected to freezing and thawing, use mechanical rotary tillage to break up the soil clods. The made beds have a trapezoidal longitudinal section, with a bottom width of about 1.6m, a top width of 0.8m, and a ditch width of 0.8m. In the center of the bed, apply 2000kg of high-quality farmyard manure, 150kg of rapeseed cake, and 25kg of compound fertilizer potassium sulfate as base fertilizer in a band. The trellis can be set up before planting or after planting. Insert a bamboo pole beside each plant and build it into a "1" shape; connect each plant in each row with bamboo poles, and build the top into a "well" shape, which can be denser to facilitate vine climbing, but ventilation must be considered while also allowing the bitter gourd fruits to hang down. The height of the trellis should allow a person to work freely in the bed ditch; generally, the distance from the bed ditch to the top of the trellis is about 1.8m.

2. Sowing and seedling raising. Raise seedlings in a small arched shed at the end of March and the beginning of April. First soak the seeds in 50°C hot water for 30 minutes, then soak them in 25-30°C warm water for 5 hours. After draining, germinate them at about 30°C under moist conditions for about 3 days. Once the shells crack and the sprouts emerge, insert them into nutrient pots, one seed per pot, cover with a small amount of soil, and after emergence cultivate some fine soil. The seedbed should run north-south. In the early stage of emergence, prevent cold snaps; in the later stage, prevent damage from high temperatures. If the temperature and humidity are too high during the seedling stage, ventilate promptly to lower the temperature and humidity. Generally, no fertilization is needed during the seedling stage. After about 20 days, when there are 2-3 true leaves, they can be transplanted, generally before rain or on cloudy days. Generally, 400-500 plants are planted per mu.

Field Management of Bitter Gourd

1. Water and fertilizer management. When planting, water thoroughly to settle the roots. One week after planting, spray 0.2-0.3% potassium dihydrogen phosphate on the leaves. Bitter gourd is drought-tolerant but prefers a moist soil environment. When drought occurs, it can be irrigated with running water. Generally, a small amount of fruiting begins around June 20, and large-scale market supply begins around July 10. At this time, apply 25kg of compound fertilizer per mu in holes, and at the end of August, apply some more compound fertilizer depending on growth conditions.

2. Field weeding. Seven days before planting, use the non-selective herbicide Nongda to treat once. After that, depending on weed growth, the grass-family herbicide Jinghecaoke can be used for weeding.

Plant Adjustment Methods for Bitter Gourd

Bitter gourd plants have very strong branching ability. Lateral vines can grow from every leaf on the main vine. Therefore, all lateral vines below 1m should be pinched off at the growing tip. For later lateral vines, as appropriate, keep 3-4 and let them go up the trellis together with the main vine. Bitter gourd plant growth has this characteristic: before the vines go up the trellis, they need to be continuously tied to the trellis until the vines climb to the top of the trellis. When the climate is dry, the vines grow slowly; after rain, the plants grow especially fast. If during the fruiting period the vines grow particularly well, some lateral vines can be appropriately removed to inhibit their growth, promote reproductive growth, and increase yield.

Pest and Disease Control Methods for Bitter Gourd

1. Damping-off. Control measures: ① Seedbed disinfection: before planting, use 70% quintozene and 50% thiram in the planting furrow for soil disinfection treatment. ② Chemical control: spray 72.2% propamocarb hydrochloride at 750 times, or Ling, mancozeb, or 58% metalaxyl · mancozeb, or 75% chlorothalonil at 600 times, or 32% metalaxyl · hymexazol at 300 times on the base of the seedlings.

2. Anthracnose. Control measures: ① Select disease-resistant varieties and disinfect seeds. ② In heavily diseased land, rotate with non-cucurbit vegetables. ③ Avoid partial or excessive application of nitrogen fertilizer; increase phosphorus, potassium, and medium and trace element fertilizers; at the same time, appropriately control irrigation and drain accumulated water after rain. ④ Remove diseased leaves, diseased branches, and diseased fruits in a timely manner, and maintain good ventilation and light transmission in the field. ⑤ Chemical control: before disease onset, spray 25% prochloraz at 1500 times for prevention; at disease onset, spray 10% difenoconazole at 1500 times or 32.5% azoxystrobin and difenoconazole.

3. Brown spot. Control measures: ① Choose plots with higher terrain and good drainage for planting. ② Set up sheds, prune branches, and remove leaves in a timely manner to improve field ventilation and light conditions. ③ Base fertilizer should mainly be organic fertilizer; topdressing should combine nitrogen, phosphorus, and potassium, and spray foliar fertilizer for cucurbit vegetables. ④ Irrigate at the proper time, promptly drain field water after rain, and pay attention to controlling field humidity. ⑤ In heavily diseased land, implement crop rotation. ⑥ Chemical control is the same as for anthracnose.

The cultivation techniques for bitter gourd are also fairly simple. It is necessary to choose the right time and then carry out germination treatment on the seeds before planting. Bitter gourd has a very strong tillering ability, so it generally also has a very high yield. Choosing to grow bitter gourd is a very good way to increase economic income.