After planting, the seedlings typically take 5-6 days to establish, and during this period, their survival rate may be slow. Once the lettuce is transplanted, it's important to provide a top dressing of water to help it settle in. For one-week-old seedlings, you can apply a light dose of fertilizer suitable for cabbage lettuce. Once the seedlings are well-established, proper water and nutrient management becomes essential. For every 667 square meters, you can dissolve 10 kg of urea in water and apply it to the soil. It's crucial to maintain consistent soil moisture throughout the growing period. However, about 30 days before harvest, you should stop applying nitrogen-based fertilizers to avoid excessive nitrate accumulation in the leaves, which can affect both quality and safety.
In addition, during the early stages of leaf curling, it's recommended to spray the plants with a 0.2% potassium dihydrogen phosphate solution. This helps strengthen the plant and improve its resistance to stress. Lettuce is sensitive to high temperatures and humidity. When temperatures exceed 25°C, it's necessary to ventilate the area, provide cooling, or use shade nets to prevent heat stress. Moreover, lettuce is vulnerable to leeches, so it's important to avoid standing water in pots and to drain any accumulated water after rain. After heavy summer rains, the field should be loosened promptly to ensure good drainage and prevent root rot.
The stems and leaves of young endemic vines are tender and juicy, so care must be taken when working in the field to avoid damaging them or the root system, as this can increase the risk of disease. During periods of high temperature and high soil moisture, if there's no dew on the leaves, it's advisable to remove yellow, old, or damaged leaves near the ground. This practice helps reduce the chances of infection and keeps the plants healthy. Regular monitoring and timely intervention are key to ensuring a successful and high-quality lettuce crop.
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