Growers with greenhouses can cultivate lettuce and other leafy vegetables in outdoor areas of sheds, making full use of land resources and improving economic efficiency. Lettuce, also known as leaf lettuce, lettuce, and other vegetables, should be named after raw food. It is an annual herb that can form leaf or young leaves in the genus Compositae. The leaves and leaves of lettuce are crisp and sweet with good flavor and rich nutrition. 1, site preparation fertilization ridging. Mu Shi farmyard manure 4000-5000 kg, 15 kg urea, 25 kg phosphate fertilizer, 30 kg diammonium, combined with ridges applied to the ridge, ridge width 50 cm, ditch width 40 cm, ridge height 15-20 cm . 2, colonization. When the seedling age is 25-35 days, three to four true leaves are planted one day before planting, and the seedlings are transplanted in the field the next day. Two lines per ridge are planted. The spacing between the lettuce plants is 20 cm and 30 cm. The lettuce is 20 centimeters and 25 centimeters. The depth of planting seedlings should not be deep-rooted, and the degree of soil surface of the seedling shoots should be slightly lower than that of the ground, and then the seedling water should be poured (or watered after planting). 3, field management, top-dressing irrigation. Planting water immediately after planting, 5-7 days after planting, recovering the first fertilizer, applying 10 kg of urea per mu, then pouring the second water; 15-20 days after planting, to promote the formation of hair trees and rosette leaves, chasing The second fertilizer, NPK fertilizer compound Mushi 15-20 kg, then poured the third water; 30 days after planting, in order to promote the close ball, the ball is large, the third time dressing, still use compound fertilizer Mushi 10 -15 kg, then poured the fourth water. Weeding and weeding. After planting 2-3 times of water, it is suitable for cultivating. After watering again, if it has not been ridged, it should be cultivated for the second time. 4. Disease and Insect Pest Control Virus Disease: Viral disease is a common disease of lettuce and it is widely distributed. Exposed planting has serious damage. The incidence rate can reach 60% or even higher. Control measures: 1 Select disease-resistant and heat-resistant varieties, and general leaf-leaf varieties are more resistant to disease than ball-bearing varieties. 2 Timely prevention and control of aphids, reduction of virus transmission, control of disease development, spray 50% anti-influx 2000-3000 times, or once again a net wettable powder (10% imidacloprid) 1500-2000 times liquid. 3 At the beginning of the disease, spray 20% virus A wettable powder 500 times or antitoxic agent No. 1 water 300 times, once every 10 days, even prevent 3-4 times, stop spraying before 10-15 days before harvesting. .
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