In the field of spring lettuce cultivation grasp five points
The spring planting of lettuce in the field is labor-saving and has high efficiency. The following five points should be grasped during the cultivation process:
One must fine-tune the soil and plant it in a timely manner. In the south-central part of our province, the time for planting spring leaved film lettuce is generally mid-March. When the lettuce plantlets grow to 6-8 functional leaves and the diameter of seedlings reaches 0.8 cm, planting is most suitable. 3-4 days before planting, the soil was irrigated with water, and cultivated every 1-2 days. Combine deep plowing with 3-5 cubic meters of fermented chicken manure, 40 kilograms of high-potassium nitrogen and low-phosphorus three-element compound fertilizer, and 30 kilograms of microbial manure per acre. Planting spacing 30-40 cm each, 4600-5000 acres of planting. Pre-planting seedbeds are sprayed to prevent downy mildew and sclerotia, combined with dismantling of membranes in order to enhance the adaptability of seedlings to the outside world. When the plants are planted, they are gently pinched, and the seedlings are removed from the nutrient pods and planted in the caves. Water immediately after planting.
The second is to lay the film in time. Pour water once a day for 4-5 days after planting, and mulch for 2-3 days after planting. First, the mulch was laid flat on the seedlings, compacted on both sides and at a certain distance from the soil, and then the seedlings were hand-pulled out, and then soil was used to seal the roots around the seedlings.
Third, we must balance fertilizer and water. After planting, control the watering as much as possible, and then send the water to the trees once the water is poured, then pour water once every 12-15 days, and stop watering for 10 days before harvest. The first top-dressing was carried out about 20 days after planting, and Mu chase ammonium bicarbonate 40 kg. The second top-dressing was carried out 20 days before harvest, with topdressing 30 kg of urea per acre and 2 times of biogas slurry with water. .
Fourth, we must do a good job in pest control. Lettuce diseases mainly include downy mildew, sclerotinia, leaf scorch, downy mildew with 88.6% mildew 800 times solution or 80% dimethomorph water dispersible granules 1600 times spray control. Sclerotinia was treated with 40% sclerotia net or 70% thiophanate-methyl 800 times spray. Leaf scorch disease was treated with 200 ml streptomycin for agricultural spraying. The spring Lettuce insect pests mainly include Liriomyza sativae Blanchard and Aphids. The Liriomyza sativae is controlled by 1.8% avermectin 1500 times spray, and the aphid can be controlled by Imidacloprid with love.
Fifth, we must harvest timely. Generally, spring lettuce is harvested about 70 days after planting, and when the growing point is flush with the outer leaves, it is suitable for harvesting.
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