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Overwintering celery colonization and fertilizer and water management techniques in protected areas
In September, it's time to start planting winter celery in greenhouses. During this critical period, proper cultivation and management are essential for a successful harvest. Here are some key points to consider:
First, proper planting and seedling selection are crucial. Before transplanting, make sure the seedlings are well-watered the day before. On the following day, carefully lift the roots and inspect them. Remove any weak or diseased seedlings, and plant those of similar size together to ensure even growth. The recommended spacing for celery is 10–25 cm between rows, while local varieties should be spaced 10–15 cm apart. After planting, water immediately to help the roots settle into their new environment.
Second, managing water and fertilizer is vital during the early growth stage. For the first 10 to 15 days after planting, keep the soil consistently moist but not waterlogged. Three days after transplanting, give the plants a light watering. Once the top layer of soil starts to dry out, gently cultivate the soil around the seedlings to improve aeration and root development. When the leaves begin to turn green, it's time to start fertilizing. Apply 10 kg of urea and 20 kg of potassium sulfate per acre, combined with irrigation. About 15 to 20 days later, when the plants reach approximately 25 cm in height, apply another 10 kg of urea. After removing the mulch, combine irrigation with 15 kg of urea and 10 kg of potassium sulfate. As temperatures drop, gradually reduce the amount of water given. Stop watering and fertilizing at least 10 days before harvesting to ensure the best quality and flavor.
By following these steps, you can maximize your yield and produce high-quality winter celery that will thrive in the greenhouse environment.