Lettuce, also known as leaf lettuce, has two kinds of leaf lettuce and cabbage lettuce. Since it can be planted in the greenhouse in autumn, winter and spring, and the quality is better than open field cultivation, it is not only popular with consumers, but also has considerable economic benefits. The main cultivation techniques are as follows: 1. Variety selection should be based on the varieties of “Yuhu†and “Emperor†imported from Japan and the United States. These varieties should be selected for their heat resistance, low light resistance, good adaptability, and strong disease resistance. Second, seedlings above the two varieties in the greenhouse generally from sowing to emergence takes 5-7 days, from the emergence to planting need 25-30 days, 50-60 days after planting can be harvested. When planting, the date of sowing should be determined based on the reference date suggested above. In order to make the lettuce evenly listed, we should take into consideration the flexible scheduling of sowing dates and broadcast volume. Practical experience shows that: Generally, every planted 667 square meters requires 10-12 square meters of seedbeds and seeds 30-40 g (g). Before sowing, the base fertilizer is evenly spread on the seedlings, flattened and then leveled, poured with water for 1 time. After the water is soaked, the screen is covered with 0.5-0.8cm of screen soil and covered with 3-5 days. After the emergence, the film is removed. After the young seedlings give birth to the true leaves, the seedlings are planted at a distance of 5-6 cm from the seedlings, and they are paid attention to moisturizing. At the same time, the temperature is controlled at 15-20 DEG C, and the temperature is released at 25 DEG C for timely release to prevent leggy and form weak seedlings. Third, planting seedlings can be planted when they grow to 5-6 true leaves. Before planting, 667 square meters of high-quality organic fertilizer 3000-4000kg, 20-30kg of diammonium phosphate, superphosphate 15kg, after sowing shallow leveling, do 1.0m wide lotus root, planting 3 rows per plant, spacing 3030cm, Planting and transplanting should be carried out with soil worms and watering after planting to facilitate seedlings. To keep the soil moist during the seedling period, it is generally possible to pour 1-2 times of seedlings. In the early stage of growth, the soil is kept dry and wet, and in the middle stage, the condition of soil moisture determines the number of times of watering. During the period of growth (envelopment period), the soil should be kept moist, and after the end of the game, the fear of warts and drought should also be controlled. Water should be properly controlled and water should not be poured to avoid cracking and rotting. The roots of lettuce are shallow, and the cultivars can be cultivated 1-2 times in the early stage, but they should not be too deep, and the cultivators can generally not be cultivated after tying the ball. Fertilization should be based on basal fertilizer. If the amount of basal fertilizer is sufficient, fertilizer may not be top-dressed. If basal fertilizer is insufficient, nitrogen fertilizer may be chased once with water in the early stage of filling. Greenhouse cultivation cabbage lettuce should adjust the temperature inside the greenhouse according to different growth stages. The general mild seedling stage, the temperature can be slightly higher, during the day 20-25 °C, 15-20 °C during the night; slow after the seedlings to the heart before the package 20-22 °C; night 8-15 °CeC; harvest period to extend the supply of room temperature can be Lower, 15-20°C during the day and 5-10°C during the night. In the early autumn and end of spring, when the temperature exceeds 25°C in the shed, the wind should be released in time to prevent the long-term high temperature from affecting the quality and growth of the lettuce. Fourth, control of pests and pests is mainly aphids, can be used 10% imidazide WP (a net rinse) 2000-3000 times liquid spray. The common disease is soft rot, which occurs mainly during the harvest period. In addition to controlling the moisture, removing the diseased leaves and harvesting in time, 75% chlorothalonil wettable powder 600 times, or 50% carbendazim 500 is also available. - 600 times liquid spray. (Heilongjiang Longmen Farm Meng Fanwen)
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