Distribution of producing area of lettuce

Lettuce is adaptable and can be cultivated in spring and autumn or overwintering. It is mainly cultivated in spring and harvested in summer. It is one of the most common vegetables on the table, but do you know where lettuce comes from? Next, oh, let's have a look together!

Distribution of producing area of lettuce

Lettuce originated from the Mediterranean coast and was introduced into China through West Asia at the beginning of the seventh century.

Growth habits of lettuce

Lettuce is sensitive to the acidity and alkalinity of soil and is suitable for planting in slightly acidic soil. The root system of lettuce is shallow, the absorption capacity is weak, and the demand for oxygen is high. Sand loam and loam are the best soil for planting lettuce.

Growth cycle of lettuce

The whole growth process of lettuce includes seed germination stage, seedling stage, rosette stage, fleshy stem formation stage and flowering and fruiting stage. The growth cycle of lettuce is about 80-100 days, which can be divided into the following cycles:

1. Germination period: it takes 8-10 days from sowing to the exposure of true leaves.

2. In the seedling stage, the true leaves were exposed to the first leaf order 5 or 8 leaves. It takes 17-27 days for direct seeding and more than 30 days for seedlings.

3. Rosette stage: from "Tuanzhu" to the third leaf, the heart leaf is flush with the outer leaf, which takes 20-30 days.

4. succulent stem formation stage: the stem expands rapidly and the leaf area expands rapidly, which takes about 30 days. Pea clip, the bean tip can be picked 30 days after sowing.