First, timely planting
In the middle region of the province, the suitable colonization period of the film lettuce in early spring is generally in late March. The general plot of Mushi rotted chicken manure 4 cubic meters, compound fertilizer 30 kilograms, boron fertilizer 1 kilogram, zinc fertilizer 1 kilogram, biological bacteria fertilizer 1 kilogram, deep leveling, made flat. Select the sunny morning planting, planting depth and the soil can be leveled. Watering after planting, planting density is generally controlled at a row spacing of 40 cm and a spacing of 30 cm.
Second, fertilize and water
During planting, planting water was planted, and the mulching film was planted the next day after planting to increase the ground temperature and quickly reduce seedlings. Due to the low temperature in early spring, it is not appropriate to water more. After 15 days of planting, the second water is poured, and then the seedlings are entered. When lettuce stems begin to swell, they should be top-dressed with water and Mushi ammonium bicarbonate 30 kg. Enter the tender stem after the expansion period is more sensitive to moisture, should always keep the soil moist, pour 1 water about 7 days.
Third, disease prevention and pest control
Downy mildew is a common disease in lettuce production. It mainly infects the leaves. After the onset, the seedlings turn yellow and die. The adult plants start from the old leaves of the lower part and produce irregular pale green to yellow irregular spots on the leaves. Corresponds to the white mold, sometimes mold layer can spread to the front of the blade. Later lesions on the leaves turned brown, connected to pieces, yellow and dry. Sometimes germs can spread to the stem, causing the stem to darken, 68.75% silver facia spray can be used to control. Ground pests such as small tigers mainly damage the roots of lettuce, and they can be used to irrigate the roots in late March. Phytophthora and whitefly can be sprayed with 10% of imidacloprid 800-1000 times.
Fourth, timely harvest
The harvest period of lettuce is at the time when the heart leaves and the outer leaves are level, and is commonly called "flat mouth", that is, when the top of the lettuce is at the level of the tip of the tallest blade, it is the best harvesting period. The harvest is too early, the yield is low, the harvest is too late and the quality is declining.
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