Lettuce is a high-temperature induction crop, and low temperatures are generally not required during vernalization. In the stage of development, the requirements for long daylight are not strict, not only spring and summer can be flowered, but also the autumn cultivation can also bloom, and it is more suitable for self-seeding. However, retention must be an excellent conventional variety, and attention should be paid to the method of seed retention.

Retention farms choose to stay in the farmers often choose the fine plants in the lettuce, but pay attention to the conditions for retention. Asparagus lettuce is apt to be affected by the wind, rain, and rain due to the convulsions, flowers, and seeds of the asparagus lettuce. Therefore, it is imperative to choose the sheltered land as sheltered from the wind, with good drainage and irrigation conditions and less fertile land. Although lettuce is a self-pollination crop, its out-cross rate is also about 1%. It is necessary to pay attention to isolation from other species and to use natural distance isolation and time isolation. The natural isolation distance is 100 to 300 meters, and the time isolation is staggered by more than 30 days of flowering.

The excellent single plant selects the field selection when winter winter meat lettuce is harvested. Select plants with the typical characteristics of this species, late bolting, close internodes, no lateral branches, few leaves, thick bamboo shoots without cracking, and no pests and diseases. Unselected plants are harvested and marketed.

Strengthen the field tube to remove the leaves and dead leaves of the selected plant strains and cultivate the soil. Open the ditch and ditch, and pay attention to often clear the drainage ditch, prevent clogging, to prevent the field of waterlogging. In order to prevent lodging caused by wind and heavy rain, it is best to insert a stand. The late growth of lettuce is prone to diseases such as downy mildew and aphids, and it is necessary to do a good job of prevention and control. Prevention of downy mildew can be used 25% metalaxyl 400 ~ 500 times spray, in the initial stage of the disease, spray a total of 2 or 3 times, every 7 to 10 days once; control of locusts can be used 10% scorpion net 2500 ~ 3000 times liquid Prevention.

When harvested in June and after harvesting, when the corolla is brown, and the white hair is spit out in the inflorescence, the seeds are basically mature and must be harvested in time. Otherwise, the white crowned hair on the seed is easily blown away by the wind, and the seeds are taken away or may be rotted. Kind of shedding.

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