There are often people who ask about different varieties of lettuce? When is planting better? Today, let's learn about the cultivation technology of lettuce, and friends who like it can pay attention.
First, temperature control
When growing lettuce, it can germinate in an environment of more than four degrees. For example, when planting in a high temperature period, it is necessary to soak seeds in a relatively low temperature environment. The temperature suitable for growth after emergence should be controlled below 20 degrees. If the average daily temperature is high or the night temperature is high for a long time, it will easily lead to convulsions and lose its commodity value.
Second, the variety selection
There are also many different varieties of lettuce, which can be divided into early-maturing varieties and late-maturing varieties according to their maturity. The former is more resistant to cold, mostly as a wintering crop, while the latter is more heat-resistant and more cultivated in autumn.
Third, planting time
Spring lettuce can be planted in October. When the weather is cool, the temperature of the soil is more suitable. It should be even when sowing. Cover the thin soil and flatten it with your feet. Keep the soil moist before sprouting. Usually it takes about a week. Growing a small seedling. If the variety of autumn lettuce can be treated in advance in low temperature, soak the seeds in cold water for several hours, then put them in the refrigerator and put them in the environment of about five degrees for about two days. When most of the seeds are white, they can be sown. . When the seedlings grow four true leaves, they can be planted, and the operation time of different varieties is different, but the reasonable spacing of the plants should be ensured.
Fourth, post management
After entering the growing season, the temperature gradually decreases, and the growth rate of the seedlings slows down. Two fertilizers can be applied after the survival. This is especially true before the freezing, ensuring that the wintering ability is enhanced, and the leaves grow in the second year, when the stems enter the expansion period. Need to give plenty of water and fertilizer. The variety of autumn lettuce is easy to convulsion in the case of high temperature and drought and lack of fertilizer, so it should be diligently watered and fertilized to ensure that the young stem becomes thick.
V. Pest Control
Lettuce is also susceptible to pests and diseases, especially downy mildew, etc. It is necessary to control planting density during prevention and prevent large amounts of water in the field. It can be rotated with other vegetables, daily field inspections, if old leaves and sick plants are found. It should be removed and destroyed immediately, and it can be controlled by spraying drugs. To prevent Sclerotium disease, it is necessary to soak the seeds in the saline solution in advance to have a bactericidal effect. After entering the growth period, the affected branches and leaves should be removed immediately, and the sclerotia can be prevented from continuing to be affected in the field.
Sixth, harvest
The leaf part can be observed, and if it has grown sufficiently and the ball is solid, it can be harvested. Usually, the yield per acre of lettuce can reach more than 500 kg. Some early-maturing varieties can be harvested in April, and late-maturing varieties can be harvested in June. If you want to keep the seeds, you can filter them in the spring, that is, when they enter the abundance period. Most of the seeds are matured and the whole plant is cut down for exposure. After picking up the seeds, they can be stored for later use.
The above is the time and key points of lettuce cultivation. You can learn from these aspects and hope to help you!
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