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Summer and autumn lettuce low temperature germination
The optimum temperature for lettuce seed germination is 15-20°C, and germination is blocked above 30°C. Summer and autumn sowing lettuce seeds, such as the adoption of low-temperature treatment after sowing, seedlings quickly, can be listed 7-10 days earlier. Low-temperature treatment method: wrap the seeds with gauze, soak it in clean water of 20-30°C for 4-5 hours, then transfer it to the refrigerator freezer to keep it at about 15°C, germinate after 3-4 days; or hung seeds Priming water on deep wells. During the germination process, the moisture condition of the seeds should be checked frequently, and the water should be insufficiently supplied, and the light should be properly seen, so that the germination is quick and the buds are neat. After germination should be appropriate sowing, otherwise affect the emergence. Summer lettuce should use heat-resistant varieties.