What should I do if the lettuce in the autumn has an early convulsion? The early convulsion of autumn lettuce means that when the stem of the vegetable is not hypertrophy, there is a convulsion phenomenon, which makes the tender stem of the edible part of the lettuce thinner, which seriously affects the commodity value and yield of the lettuce, so it is necessary to take certain The preventive measures are as follows.
First, the reasons for the early convulsions of lettuce in autumn
The early brooding of lettuce in autumn was mainly due to the weather. After the lettuce was planted in August, the growth of lettuce seedlings had been in a high temperature environment of 25 degrees or more. Due to the small temperature difference between day and night, the plants had strong respiration, which made the lettuce seedlings appear as long as possible. After colonization, the temperature has been at a high temperature. Coupled with long-day conditions, lettuce plants have less leaf differentiation, early flower bud differentiation, and faster flower development. If management measures cannot be kept up at this time, it is easy to cause lettuce. The plants are long and convulsive.
Second, measures to prevent early convulsions of lettuce
1. Variety selection: When planting lettuce, it is necessary to choose late-maturing varieties suitable for summer and autumn cultivation, which are not easy to twitch, such as special heat-resistant white skin, spring and autumn two-green skin.
2, cultivating strong seedlings: when planting lettuce, the amount of sowing should be moderate, not too large; after planting and time seedlings, seedbed watering should be reasonable, so that you can see the wetness of the bed soil; shading measures during lettuce seedlings Reduce direct sunlight and lower the ground temperature. After the lettuce is planted, the cover should be gradually covered and the sunshade net should be removed. When the lettuce grows 3 leaves, it will no longer be shaded.
3, timely colonization: autumn lettuce seedlings can not be too long, when growing 4-5 true leaves should be fixed. It is important to know that if it is not planted in time, the seedlings will grow up because they grow too fast, and it is difficult to obtain the fat stems after planting.
4, timely harvest: high-temperature season lettuce often has been formed before harvesting flower buds, so it should be harvested in time, otherwise the lettuce will quickly convulsion. When the autumn lettuce is harvested, the heart leaves and the outer leaves are suitable for the period of time. When the harvest is sunny, the top growth points or flower buds of the lettuce are removed.
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