Non-pollution summer lettuce cultivation technology
Summer pollution-free lettuce planted in May-August. Lettuce is a vegetable that is widely cultivated in the north and south of China. Its stems and leaves can be eaten and enjoyed by consumers. Lettuce can be planted in all seasons, 4000-5000 strains per acre, yield 2500-4000 kg, with 30-50 grams. The key technologies for summer cultivation are: 1. Soil selection Lettuce has a wide adaptability, and the soil requirements are not very strict. Generally, plains and slopes can be planted. However, in order to obtain higher benefits, fertilization or energy can be selected. Land for irrigation. For less fertile soils, the application of organic fertilizers should be increased, and mulching films can also be used in relatively dry fields. Second, summer lettuce breeding techniques and seedling management soak germination. Can use the refrigerator germination or vacuum flask plus ice germination method. Soak the seeds for 4-6 hours, then pull them up and put them into a small cloth bag. The seed skin water in the small cloth bag is shaken off and then mixed with loose powder and placed on the fresh-keeping layer of the refrigerator. You can also place 1-2 pieces of ice cubes in a thermos bottle, and then hung the seeds in the bottle (be careful not to touch the water below). Remove the seeds every 24 hours and rinse them with clean water. After 48 hours, the buds can be sprouted. Open the hatchery. The seedbed is made 1 meter wide and 20 meters deep, and the length varies with the amount of seed used. Carry the mud on the surface of the car and pour the surface of the car with water. Smooth it with a sand board. If the mud is not dry, spread the seed by 1 g per square meter (dry seed) evenly. On the surface of the car is a small shed, covered with rain and covered with sun shade. When the seedling leaves the true leaves, 800 times of carbendazim water can be sprinkled with a watering pot. Generally, the seedlings on hot days should not be planted too much, and the seedling age of 15-25 days is appropriate. Third, the field of finishing and fertilization 1, disinfection. More diseased plots can be spread on 1 square meter with 3-5 grams of carbendazim, or applied with 100 kg of quick lime per acre. After spreading, plowing and mixing. (Note: Quick lime cannot be used for years.) 2, more pests available phoxim per kg mixed 20 kg fine soil applicator. 3, fertilization is mainly used one-time base fertilizer. Each mu of fertilizer formula is as follows: 1 rot 3000 tons of manure, 50 kg of phosphate fertilizer, 20 kg of potassium fertilizer, 20 kg of urea. 2 Decomposed farmyard fertilizer 1000 kg, dry mature oil 100 kg, phosphate fertilizer 50 kg, urea 20 kg. 3 3000 kilograms of chicken, duck and manure, 10 kilograms of urea and 20 kilograms of potash. 4, the whole compartment. After evenly applying the fertilizer to the field, plowing is done (2 meters in summer, 4 meters in spring and autumn, 30 meters deep in the ditch, and 20 cm deep in the ditch). IV. Transplanting and Management of Summer Lettuce In the block where the base fertilizer is applied and the car is properly handled, transplanting is carried out. 2 meters open, colonization of 5 lines, 35 cm from the nest. The seedlings on the seedling bed are shoveled together with a shovel or shovel (usually shoveled 3 cm thick) and transplanted. At the time of transplanting, the soil blocks were cut with a razor blade so that each seedling had more than 50 grams of mud, and there was no need for mud blocks. The surface of the clod is parallel to the surface of the box, so it cannot be planted too deeply and then poured enough water. Formerly planted spring vegetables, if the rain is more, the soil is moister, and it is not necessary to use a cow or a tractor to plow. Spread the fertilizer evenly on the ground, use manual tilling to mix, and then repair the trench again, dig the topsoil with a hoe, and then transplant the lettuce. 3, weeding weeding. As summer lettuce grows faster, it is generally only cultivating once. Ten to 15 days after transplanting, a nest weed can be pulled 20 days after transplanting. 4, top dressing replenishment. Summer lettuce can see seedlings fertilizer. If the seedling grows poorly, it can be used in the early stage with 20 decomposed human feces and feces plus 20 kg of urea, top dressing 1-2 times, and the remaining time can be poured 1-2 times. The lettuce cultivated in summer is good for the small car. If it is rainy, it will not need to be watered. If the sun is big, the soil is dry and it can be filled with water. The best choice for irrigation is in the evening. If the soil is heavy, it is necessary to follow the irrigation, so that there is no water in the ground.