Spring equinox has tips
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September 25 06:12:57, 2025
As spring arrives, the cold begins to fade, and temperatures rise quickly. In North China, the average daily temperature has already exceeded 10°C, marking the arrival of a bright and promising spring season. The Spring Equinox signifies the thawing of the land and marks the peak period for planting, sowing, and managing vegetables.
During this time, greenhouse crops such as tomatoes, peppers, eggplants, and cucumbers are being transplanted. It's essential to monitor weather changes and take advantage of the "cold tail, warm head" window for planting. Solanaceous crops like tomatoes and eggplants should be transplanted when the soil temperature at 10 cm depth reaches above 10°C, while cucumbers and melons can also be planted under similar conditions. In the Beijing Plain, this typically occurs in late March. If seedlings are too large and the ground is still cool, using multiple layers of covers inside the greenhouse can help raise the temperature.
In addition, it’s important to clean the fields by removing old crop residues, dead leaves, and weeds, then transporting them outside for proper composting or treatment. Pay attention to applying sufficient organic fertilizer, preparing the soil thoroughly, and ensuring proper spacing between plants for optimal growth.
For fruit and vegetable management in solar greenhouses, maintaining appropriate temperature and humidity is crucial. During the day, keep the temperature between 23°C and 30°C, and lower it to around 15°C at night. On cloudy days, reduce the temperature slightly and increase ventilation. Enhance light exposure by cleaning the greenhouse film regularly to improve light transmission. Manage water and fertilizer scientifically, and perform timely pruning, vine training, and removal of yellow or old leaves. Disease and pest control is also vital—cucumbers are prone to downy mildew, powdery mildew, and angular leaf spot, while tomatoes may face leaf mold and late blight. Insect pests such as aphids, whiteflies, thrips, and cotton bollworms should also be monitored and controlled.
For cabbage, cauliflower, lettuce, and other brassica crops, it's recommended to acclimate the seedlings 5–7 days before planting. In the Beijing Plain, this usually happens in late March, and using a cover film can help increase the temperature effectively.
When sowing leafy and root vegetables like radishes, carrots, parsley, fennel, and spinach, prepare the soil well and apply high-quality, well-decomposed organic fertilizer as a base. Use either direct seeding or broadcasting methods, water the bed thoroughly before sowing, and cover with mulch. Remove the mulch once the seedlings reach about 70% height. Alternatively, use bamboo frames to cover with agricultural film to raise the temperature, allowing earlier planting by 10–15 days.
For open-field winter vegetables such as spinach, scallions, and leeks, it's time to cultivate them, remove dead leaves, apply well-decomposed organic fertilizer, and water appropriately in late March. For amaranth, biological or safe pesticides can be used to control pests like cockroaches.
This period is crucial for farmers, requiring careful planning and timely actions to ensure a successful growing season. With proper care and attention, the spring equinox brings new opportunities for a bountiful harvest.
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