First, after planting, it's essential to focus on seedling care by encouraging early root development. During this phase, watering and fertilizing are generally avoided unless the soil becomes excessively dry or the plants show signs of legginess. It's important to maximize the photosynthetic area by ensuring proper sunlight exposure. As soon as new leaves appear, a light watering is recommended to support healthy growth.
For early flowering management, implementing a variable temperature regime can significantly improve fruit set. Daytime temperatures should be maintained around 20°C to 25°C, while nighttime temperatures should drop to between 11°C and 18°C. Removing the straw curtain as soon as possible helps raise greenhouse temperatures quickly. Regularly cleaning the plastic film allows more light in, increasing light intensity and extending the time plants spend in the sun. Avoid overwatering or overfertilizing, and make sure to train vines properly, removing tendrils and side shoots to promote better air circulation and plant structure.
During the fruit-setting stage, temperature control is crucial. By 10 a.m., the greenhouse temperature should rise to 28°C to 30°C, and when it exceeds 32°C, ventilation is necessary. In the afternoon, the temperature should be kept between 20°C and 28°C, while at night, it should range from 18°C to 20°C during midnight and drop to 15°C to 11°C later. The relative humidity should remain around 85%. Once the fruits begin to set, water them thoroughly and apply 15-20 kg of ammonium nitrate per acre with water to stimulate above-ground growth. A top dressing every 10 to 15 days is advised, ensuring that the plants do not show signs of drought stress. As the fruiting period progresses, increase irrigation and follow a balanced fertilization plan. The total fertilizer ratio should be N:P:K = 5:3:7, using components such as diammonium phosphate, potassium sulfate, or potassium nitrate along with urea. During deep winter, the minimum greenhouse temperature should stay above 10°C, and the irrigation water should be warmer than 12°C. If needed, flowers can be soaked in a 25 mg/kg solution of 2.4-D to help preserve fruit. In case of prolonged cold or cloudy weather, harvest smaller fruits to avoid damaging the plants, and extend light exposure without affecting greenhouse temperatures. On snowy days, ensure at least two hours of sunlight each day.
When harvesting, it's best to pick melons that weigh about 200 to 250 grams. On colder or overcast days, reduce the size to 150 to 200 grams to maintain quality and prevent stress on the plant.
Second, common physiological issues in winter cucumber greenhouses include malformed fruits such as large-headed melons, bee-bellied melons, sharp-lipped melons, curved melons, and hollow-fruited ones. These problems are often caused by insufficient light, extreme temperatures, irregular watering, uneven nutrient supply, severe pest infestations, or overcrowding. Proper management of light, temperature, and water is key to preventing these issues.
Another common problem is yellowing tips, especially during the deep winter season. The tip of the cucumber turns yellow-green, which may be related to the variety, but is often linked to low temperatures, particularly if the soil is too cold. This condition can affect both the quality and yield of the crop, so maintaining stable and warm conditions is essential for healthy growth.
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