Greenhouse vegetable seedlings can suffer from root-related physiological disorders, often due to improper management practices. Initially, the roots may show signs of rust, and in severe cases, they become rotten with no new roots forming. This leads to yellowing and wilting of the seedlings, eventually resulting in their death.
1. Maintain an appropriate temperature. The preparation of the bed soil should be done properly. After sowing, ensure that the soil is sufficiently warm. During rainy days or when there is insufficient light, take measures to provide warmth and insulation. In early spring, it's best to use electric heating beds for seedling cultivation, as this helps maintain a stable temperature and improves survival rates.
2. Control humidity effectively. When raising seedlings in greenhouses or shelters, avoid watering the seedbeds excessively, especially when the plants are close together. Water only when necessary, and do not overwater. If the soil becomes too dry, cover it with moist fine soil. This helps meet the seedlings’ water needs while reducing air humidity. If the humidity is too high, you can sprinkle ash or ventilate the area during the hottest part of the day to lower moisture levels.
3. Ensure adequate lighting. Before starting the seedling process, choose a location with sufficient sunlight for the seedbeds. Good light promotes strong growth, enhances disease resistance, and reduces the occurrence of root problems in vegetable seedlings.
4. Use organic fertilizers. To grow healthy vegetable seedlings, it's important to increase the application of farmyard manure, particularly well-rotted hot manure. This improves soil fertility, strengthens the seedlings, boosts their resistance to diseases, and raises the ground temperature, which helps prevent diseases. The method involves mixing fully decomposed hot manure with the bed soil before planting. However, it's crucial to use only fully decomposed manure, as fresh manure can burn the roots.
5. Ventilate regularly. Once the cotyledons have unfolded, choose a clear and warm day to open the cover for ventilation. Spread a thin layer of dry soil evenly over the seedbed and then re-cover it tightly. This helps reduce soil moisture and also provides some warming effect, promoting healthier seedling development.
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