Distribution of the latest lettuce production area
Asparagus lettuce adaptability is strong, can spring and autumn or winter cultivation, mainly in spring cultivation, summer harvest, is one of the most common vegetables on the table, but do you know what lettuce origin? Let's take a look at it together!
Distribution of lettuce production area
Lettuce originated in the Mediterranean coast, about the beginning of the seventh century, introduced into China by West Asia, widely cultivated everywhere.
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 oxygen requirement is high. The soil for planting lettuce is sandy loam and loam.
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 true leaf appearance.
2. Seedling stage: true leaves emerge to the first phyllotaxis 5 or 8 leaves and one part of them unfolds. Direct seeding takes 17-27 days; seedling takes more than 30 days
3. Rosette stage: from "cluster tree" to the third leaf order, the heart leaf is flush with the outer leaf, which takes 20-30 days.
4, fleshy stem formation period: stem rapid expansion, rapid expansion of leaf area, it takes about 30 days. Pea clip, 30 days after sowing can be picked bean tips.
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The latest method of accelerating germination of lettuce seed
Lettuce likes to be cold and cool, and the optimum temperature for seed germination is 15-20 ℃. If the temperature is above 30 ℃, it cannot germinate. Autumn lettuce is sown in early autumn, when the temperature is high and it is difficult to germinate, so it is generally necessary to accelerate germination before sowing. Let's take a look at it.
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The latest planting techniques of Zizania latifolia
Zizania latifolia has two types: autumn single season Zizania latifolia and autumn and summer double season Zizania latifolia. Both of them are propagated by dividing plants. The Yangtze River Basin single season Zizania latifolia is planted from Qingming to grain rain. Summer and autumn double season Zizania latifolia can be divided into spring and autumn. Spring planting is before and after grain rain, and autumn planting is before and after the beginning of autumn. Let's take a look at it together.
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