Science watering After easing the seedlings, the number of times of watering should be determined by looking at soil moisture and growth conditions. Usually 5-7 days a water. When the temperature is low, the amount of water should be small, and the date of watering interval should be long. When the water is growing, the amount of water needs to be large, and the soil should be kept moist. After the formation of the leaf ball, watering should be controlled to prevent the water from being uneven and cause fissure ball and rotten heart. When the protective cultivation begins to bury the ball, watering must ensure the plant's need for water, but not excessive, and control the humidity in the field. It should not be too large to prevent the occurrence of disease. Weeding and weeding After planting and regenerating seedlings, we should carry out cultivating and weeding to increase soil permeability and promote root development. top dressing Base fertilizer is the main fertilizer. When the base fertilizer is sufficient, no fertilizer can be produced in the early stage of growth. At the beginning of the initial period, nitrogen fertilizer is chased once with the water to promote leaf growth; the second time is 15-20 days, and the NPK fertilizer is better. , About 15-20 kg per mu; When the heart leaves start to curl inward, apply a compound fertilizer once again, about 20 kg per mu. Pest Control Diseases mainly include downy mildew, soft rot, viral disease, dry rot, and top burning diseases; insect pests mainly include leafminers, whitefly, aphids, and thrips. Diseases and pests should be based on prevention, and field management should be strengthened. For chemical control, low-toxicity, high-efficiency and low-residue pesticides should be used. Attention should be paid to the withdrawal of drugs 15 days before harvest. Scientific harvesting The collection period of loose leaf lettuce is relatively flexible, and there is no strict requirement for the harvesting specifications, which can be determined according to the needs of the market. The harvest of lettuce must be timely, according to different varieties and different cultivation seasons, generally after 40-70 days after planting, the formation of leaf ball can be harvested by light pressure with a sense of reality, only to strengthen field management, vegetable farmers have good The benefits. Canned Tuna,Fresh Canned Tuna,Frozen Canned Tuna,Canned Skipjack Chunk ZHEJIANG RETRONX FOODSTUFF INDUSTRY CO.,LTD , https://www.retronxfoods.com