Summer pollution-free lettuce is planted in May-August. Lettuce planted 4000-5000 plants per acre, with a yield of 2500-4000 kg, with a seed amount of 30-50 grams. The key technologies for summer cultivation are:

1. Soil selection: Lettuce adapts widely, and the soil requirements are not strict. Generally, plains and slopes can be planted. However, in order to obtain higher benefits, it is necessary to choose fertile land that can be irrigated. For less fertile soils, it is necessary to increase the application of organic fertilizers, and in relatively dry fields, mulch can also be used.

2, summer lettuce seedling technology and seedling management soaking germination: can use the refrigerator germination or thermos bottle with ice germination method. After soaking the seeds for 4-6 hours, pick them up, put them into small cloth bags, dry the seed skin in the small cloth bag, mix them loosely, and put them in the fresh-keeping layer of the refrigerator. You can also put 1-2 pieces of ice in the thermos bottle, then hang the seeds in the bottle (be careful not to touch the water below), take out the seeds every 24 hours, rinse them with water, and bud them in about 48 hours.

3, open box nursery: seedbed made 1 meter wide, groove depth 20 cm, the length depends on the amount of seed. The surface of the carcass is fine, the surface of the car is drenched with water, smoothed with sand, and the mud is not dried. It is spread evenly by 1 gram of seed (dry type) of 1 square meter. A small arch shed is made on the side of the car, and the rain is covered with a film, and the sun is covered with a sunshade net. When the seedlings are out of the true leaves, they can be sprinkled once with 800 times of carbendazim water. Generally, the seedlings of hot days cannot be planted too much, and the seedling age of 15-25 days is appropriate.

4. Finishing and fertilization of Daejeon:

disinfection. Fields with more diseases can be applied with 3-5 grams of carbendazim per square meter or with 100 kilograms of quicklime per acre. After the application, plow and mix. (Note: quicklime cannot be used for years).

Fields with more insect pests can be applied with 20 parts of phoxim per acre of fine soil.

Fertilization mainly uses one-time application of base fertilizer. The formula of fertilizer per mu is as follows: 3,000 kg of manure and manure, 50 kg of phosphate fertilizer, 20 kg of potassium fertilizer, 20 kg of urea or 1000 kg of decomposed farmyard manure, 100 kg of decomposed oil, 50 kg of phosphate fertilizer, 20 kg of urea, or decomposed chicken and duck manure 3000 Kilograms, 10 kg of urea and 20 kg of potash.

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