Scientific watering
After the seedling water is used, it is necessary to look at the soil moisture and growth conditions to master the number of watering. Usually water is poured in 5-7 days. When the temperature is low, the amount of water should be small, and the date of watering interval should be long; the amount of water needed during the growth period should be kept moist, and the soil should be kept moist; after the formation of the leaf ball, watering should be controlled to prevent uneven water, causing cracking and rotten heart; When the cultivation of the protected area begins to form a ball, the watering must not only ensure the plant's need for water, but also not excessive, and control the humidity in the field. It should not be too large to prevent disease.
Cultivating weeding
After planting and slowing down the seedlings, weeding and weeding should be carried out to enhance soil permeability and promote root development.
top dressing
Mainly based on the base fertilizer, when the bottom fertilizer is sufficient, the top stage of growth may not be topdressed. At the beginning of the ball formation, the nitrogen fertilizer will be chased once with water to promote the growth of the leaves; the second fertilizer will be chased for 15-20 days, and the compound fertilizer with nitrogen, phosphorus and potassium is better. About 15-20 kg per acre; when the heart leaves begin to curl inward, apply a compound fertilizer once, about 20 kg per acre.
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, and strengthen field management. For example, chemical control should use low-toxic, high-efficiency, low-residue pesticides, and pay attention to 15 days before harvest.
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 formation of the leaf ball can be harvested by hand pressure. Only when the field management is strengthened, the vegetable farmers have good. Benefits.
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