Autumn Lettuce Non-pollution Cultivation Technique
1 Variety Selection The temperature in autumn is relatively high. Generally, lettuce varieties tend to twitch at high temperatures, resulting in slender stalks and low commodity value. Therefore, mid-late-maturing varieties with strong heat resistance must be selected. The city's traditional variety, Shazhou Qingpiang lettuce, is characterized by its high heat resistance, long oval leaves, dark green color, dark blue skin, tender fresh green meat, strong aroma, and not easy to convulsions in hot season, single stem weighing more than 0.5kg, Suitable for autumn cultivation. 2 timely sowing timely sowing is conducive to improving the yield and economic benefits of lettuce, to August 12th to 25th for the sowing date. 3 The suitable temperature for cultivating seedlings of strong lettuce seeds is 15-20°C, but in August, the temperature is above 30°C, so it is not easy to germinate, and low-temperature germination is required before sowing. Soak the seeds in clean water for 2 to 4 hours. After soaking, remove the seeds and wash them with gauze. Place them in a refrigerator and keep the temperature at about 4°C. After 48 hours, rinse with fresh water. Spread out to 2 ~3cm thickness is good, covered with wet gauze, put in natural temperature. When the seeds are white, take them out in the shade and wait until 80% of the seeds germinate. Seeding seedbed should be leveled and properly broadcast. Usually 50g seeds are sowed at 25m2. When sowing, the seedbed is kept moist. After sowing, it is covered with a shade net. After the emergence, the shade net will be uncovered in time. It is better to open the net in the evening. After the true leaves are grown, the young plants are planted and the young plants are not crowded with each other. 4 The age of planting autumn lettuce is 25-28 days, which should not exceed 30 days. Before plotting, the flat and fertile plots should be selected. In combination with ploughing, 100kg of organic compound fertilizer and 60kg of compound fertilizer should be applied per 667m2. To prevent and control underground pests, phoxim should be evenly sprayed, and the amount of 667m2 should be 250g. Using deep trench sorghum, choose cloudy days or colonization after 4 pm, to bring soil to plant seedlings to facilitate the survival of seedlings, planting spacing of 25cm, spacing 40cm. After the planting, the root water is poured in time to keep the soil moist. 5 Keep the soil moist after planting in the field. When the soil is dry, it should be watered in time. The watering time should be after 4 pm and weeds should be removed timely. Autumn Lettuce growth time is short, so after the live tree will be applied Miao Fei, combined with water, 667m2 application of urea 5 kg; when the leaves turn from the upright flat, combined with water topdressing open fertilizer, 667m2 Urea 10kg; During the closure, every 667m2 of urea was reclaimed with 10kg of urea and appropriate irrigation to promote the expansion of the plant and increase the yield. 6 Pest control The main pests of autumn lettuce are aphids and underground pests. Aphids can be controlled by imidacloprid. Underground pests can be controlled by phoxim. The disease has downy mildew and can be treated with DuPont Kelu. 7 Timely Harvest When the tip of the main stem of the lettuce and the tip of the tallest leaf are harvested at the same time, the tender stem has a long foot, the texture is crisp, the flavor is strong, and the quality is good.