How to do lettuce cultivation for high yields? The growth environment of lettuce is like a cool environment, and lettuce is neither cold nor heat resistant. The following Hui Nongwang Xiaobian will discuss with you.
First, soil selection
The soil in which the lettuce is grown should be selected from the slightly acidic soil with rich organic matter, strong fertilizer and water retention capacity, and good permeability.
Second, the variety selection
Lettuce planting varieties can be selected to have strong disease resistance and resistance to cold and heat, such as glass lettuce, Caesar, and leaf lettuce.
Third, sowing seedlings
If it is sown in hot, hot weather, the seeds must be germinated at low temperatures. In the winter and spring greenhouses or lettuce cultivated in open field, attention should be paid to the insulation of the seedbed.
Fourth, colonization
The glass lettuce is about 25 days old, and it can be planted when 4-6 true leaves are planted. The row spacing is 14cm×18cm. "Bearing lettuce" seedling age 30--35 days, 5-6 pieces of true leaves when planting, plant spacing 17cm × 20cm, 畦 width 0.8m-0.9m. The planting site applies 4000-5000 kg of organic fertilizer per 667 m2, 20 kg of superphosphate or 50 kg of compound fertilizer.
When planting, soil root should be taken and root water should be poured in time. The depth of planting should not be buried in the heart. If planting in the hot season, the scaffolding should be set up on the morning of the planting, covering the shade net, and transplanted after 4 pm. Winter and spring cultivation can be covered with a mulch film. Transplanting in greenhouses, the temperature should be controlled at 12 °C - 22 °C during the daytime. If the temperature is too low, the temperature should be kept warm. When the temperature is higher than 24 °C, the film should be ventilated and cooled. Under normal circumstances, the greenhouse film can be opened.
Five, watering
Watering needs to be combined with the growth of lettuce and soil conditions to determine the number of watering. Generally, it can be poured once every five to seven days. Watering should not be excessive, resulting in increased humidity and disease.
6. Cultivating weeding
After planting and slowing down the seedlings, weeding and weeding should be carried out to enhance soil permeability and promote root development.
Seven, topdressing
Mainly based on the base fertilizer, the bottom fertilizer can not be topdressed in the early stage of growth. At the beginning of the ball formation, the nitrogen-sow fertilizer will be used to promote the growth of the leaves; the second fertilizer will be pursued in 15-20 days, and the nitrogen, phosphorus and potassium compound fertilizer is better. About 15-20 kg of mu; when the heart leaves begin to curl inward, then apply a compound fertilizer, about 20 kg per acre.
Eight, pest control
The main diseases are downy mildew, soft rot, viral disease, dry rot, top burning disease, etc.; insect pests mainly include leaf miner, whitefly, aphid, thrips and so on. Pests and diseases should be based on prevention. Strengthen comprehensive measures such as field management. Chemical control should use low-toxic, high-efficiency, low-residue pesticides and stop the drug 15 days before harvesting.
Nine, scientific harvesting
The harvesting period of loose leaf lettuce is relatively flexible, and the harvesting specifications are not strictly required, and can be determined according to market needs. The harvesting of the lettuce must be timely. According to different varieties and different cultivation seasons, 40-70 days after the general planting, the leaf ball is formed, and the hand can be harvested with light pressure.
The above is all the key points of high-yield lettuce cultivation. Can you find out what other places need to be added? If you want to see more detailed content, you can continue to pay attention to Hui Nong!
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