Lettuce cultivation techniques
October 20 10:03:10, 2018
Cultivation of Spring Lettuce: (1) Seeding Period: Lettuce exposed in the Yangtze River Valley for winter, mainly for spring lettuce, usually sown in the first year of fall from September to October, 40-50 days when the seedlings with 5-6 leaves, planting, winter can Safe winter, full time after the spring return to green growth leaves, harvest from April to May can get high yield. (2) Cultivate strong seedlings: Lettuce will be transplanted. Seedbed selection of fertilizers to maintain water, loose loose fertile loam, the first application of compost manure urine turned into base fertilizer. Seeding amount per seedling 100-150 grams, can be planted two acres. After sowing, the cover is covered with a layer of fine soil and moistened with grass tablets. After 7-8 days of bud emergence, the grass pieces are removed and the top dressing is applied 2-3 times. Each piece of ground water is 50-100 kg of feces or 0.5-1 kg of urea. Cotyledon flat and 1-2 leaves each time when the seedlings were transplanted once a week before transplanting, with 0.5-1 kg of urea per minute, and the water was sprayed one day before the emergence to avoid rooting. Large and small seedlings are planted separately to facilitate field management. (3) Soil fertigation and reasonable close planting: Lettuce requires a large amount of fertilizer, and it is necessary to select strong fertility to loose loose soil, use 3000-4000 kilograms of manure or garbage, and 1500-2000 kilograms of manure as basic fertilizer, and then turn it into 1.6 meters (even the ditch). Face to face. Planting density varies by species and season. For early maturing species, the plant spacing is 18-23 cm square, and the planting area is 8500-12000 plants per mu; the late mature plants are 25-30 cm square and the mu plants are 7000-8000 plants. (4) Field Management: Spring Lettuce Seedlings grow over winter, the early growth is slow, the amount of fertilizer needed is small, and once diluted fertilized water after planting, if the intercropping can not be used for basal fertilization, the application should be increased by 1-2 times for the feces. 1000-1500 kg, combined with cultivator sparse soil, promote root growth. Before winter, it is necessary to control fertilizer and water, avoid leggy, increase cold resistance, and secure winter. After the spring, the stems and leaves grow rapidly. After entering the rosette period, the cultivator loosens the soil in time and raises the soil temperature. In combination with topdressing, Mushi 30% human excrement 1000 kg. After plant closure, the hypertrophy of the stems was accelerated, and the amount of fertilizer needed was increased. The top dressing was applied 2-3 times, totaling 2000-3000 kg of human waste or 30-40 kg of urea to ensure stem enlargement. Fertilization should not be too late to avoid cracking the stem. (5) Timely collection and selection of seedlings: At the same time as the growth of the fleshy stems of lettuce, the buds are formed on the tops of the lettuce. When the tops of the stems match the tips of the tallest leaves, they are suitable for harvesting, and the tender stems have been fully expanded to the best quality. Lettuce seedlings adopt different methods according to different types and regions. Lettuce is preserved with winter spring lettuce. The September harvest in the Yangtse River Valley in September can be selected from the field with the characteristics of this species, late bolting, dense internodes, less leaves without branching, bamboo shoots thick and long without cracking, disease-free plants. The selected plant strains will remove the yellow leaves from the lower part and remove other bad strains. The row spacing shall be maintained at 33 cm square, and a spatula shall be applied after sparsely applied to promote the elongation and branching of the flower stems, and the pillars shall be put down. The lettuce has a long flowering period. Seeds of different parts of the plant have different maturation periods. The mature seeds are very light. They have umbrella-like crowns and are easy to fly with the wind. When the leaves are yellow, the seeds are brown or silver gray. Umbrella-like crown hair, harvested in time, dried and stored. Lettuce is a cross-pollination plant, so the species should be kept above 2,000 meters for seedlings. In order to avoid the degradation of hybridization.