Spring lettuce was sown in spring that year, and the temperature of leaf cluster growth and stem hypertrophy was already high after planting. Not only was it late to market, the suitable growth period was short, and the yield was not high. Therefore, autumn sowing should be implemented in areas where the open field can live through the winter, so that the seedlings will live through the winter when they reach 4 to 5 leaves before winter, and they will be planted in spring. In this way, the root system and leaf clusters are fully grown. After the flower stems are tapped from April to May, they can grow rapidly under the condition of sufficient nutrition and suitable temperature, resulting in higher yield and better quality.
Seedlings are planted in autumn in Guanzhong area, and it is advisable to sow in early and mid September. If sowing is too late, the seedlings are small and vulnerable to freezing damage, and sowing in autumn should not be too early, otherwise the seedlings are prone to flourish, susceptible to freezing damage, and the flower buds differentiate early, and the next spring is easy to "flee".
Seed seeds per mu are about 1.5kg, and the ratio of seedbed area to cultivated area is about 1:100. After emergence, one is to have time for the seedlings to prevent the seedlings from crowding, keep the seedling distance between 3~4cm, and ensure a certain nutrient area. Properly control irrigation during the seedling period to make the leaves thick and flat, cultivate strong seedlings and prevent excessive growth. Areas that can live through the winter open in winter should be planted before winter. Because the root system of planting before winter is well developed, the following spring will grow quickly, so it can be marketed early and the yield is high. Spring planting (colonization) can be implemented in areas where seedlings are planted late in autumn, or the seedlings are too small due to various reasons or cannot be safely overwintered in winter. Spring planting should be carried out as soon as possible after the soil has thawed.
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