Prevention and cure of deformed seedlings in plastic greenhouse

Leggy seedlings are characterized by thin stems, elongated internodes, narrow leaves, and a pale color. This condition is typically caused by excessive heat and humidity within the greenhouse. To prevent this, first, ensure proper ventilation according to the seedlings' temperature and humidity needs. Second, keep the covering material clean to maximize light exposure and extend the lighting period. Third, avoid overcrowding the seedlings to ensure they receive sufficient nutrients and space for healthy growth. Aging seedlings tend to be small with short stems, poor root regeneration ability, and thick, dark green leaves. This issue usually occurs when seedlings remain in the nursery for too long. To manage it, strictly control the seedling age and maintain appropriate watering practices. Avoid overwatering, as it can lead to weak and stunted growth. In cases where root development is poor, no new or adventitious roots may form, and the root bark turns brown before rotting, leading to yellowing and wilting of the plants. To address this, first, select well-drained land for the seedbeds and raise the ground temperature if necessary. Second, apply a solution of Tianda 2116 diluted between 200 to 500 times along with a root stimulator. Third, maintain daytime temperatures between 20°C and 25°C and nighttime temperatures around 15°C to promote healthy root growth. When seedlings emerge but the seed coat fails to shed properly, the cotyledons may not open fully, which hinders photosynthesis and results in weak, underdeveloped plants. To prevent this, apply organic fertilizer and water the seedbed thoroughly before sowing. After planting, cover the seeds with an appropriate layer of soil. Additionally, use mulch or insulating film to protect the seedlings and ensure optimal growing conditions.

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