Spring arch shed species listed in midsummer

Fresh oysters are generally only available in the winter, but if they are cultivated in small arches in the early spring, they can break the laws of nature and allow fresh oysters to supply the market during the summer season. The production benefits are considerable. First, the choice of soil. The choice of low-lying land or ditches should be based on the use of high groundwater tables, long-term wetness or water retention, thick silt layers, convenient drainage and irrigation, and easy access to water. Second, build a shed pool. Generally, in early April, bamboo and wood materials are used to construct ordinary pillar-free arch sheds. Their orientation and size are determined by the topography. Most of them are north-south and tend to provide ventilation and lighting. They are 20 meters long from north to south, 3 meters wide from east to west, and 1.5 meters high. First, dig a deep pit pool of 0.4 meters, level the ground, compact the ground, lay a layer of 0.10-0.12 mm thick polyethylene film, and require the membrane to be 0.3-0.5 meters higher around to prevent leakage and leakage during growth; The pits will be filled with soil fertilization in combination with soil preparation. However, the filling should be filled with different layers of soil. At the same time, the soil around the field should be repaired and solidified so that water can accumulate in the future. Third, select the appropriate species. Should choose to be more resistant to low temperature, low light, strong growth potential, high yield and the market's best-selling early maturing varieties as cultivars. According to the experiment, Daphne species is a more suitable species. Fourth, the basal fertilizer for soil preparation. The principle of “panning nitrogen, increasing phosphorus, supplementing potassium, and timely recovering trace fertilizer” should be adopted. 50 kg of diammonium phosphate, 40 kg of potassium sulfate compound fertilizer, and decomposed mushroom waste or chicken manure can be used per acre of the fill pond soil. 1000 kg. After spreading evenly, deep-throw and simmer 2 times, and pour 1 time in 10 days before planting, then close the greenhouse to raise temperature. Fifth, colonization as soon as possible. Before planting in open field (according to local climate conditions and cultivation habits) for 1 month, when the temperature is relatively stable (15°C or more), planting will take place. Before planting the seedlings from the motherland, they should be soaked in a mixture of 20% carbendazim wettable powder 600 times and gibberellin 1000 mg/kg for 3 to 5 minutes, then the spacing between the rows should be 15 cm 1.3. The rice is spread out. Each acre requires 210 kg. In general, each small arch shed is planted in 3 rows, and the rims of the 2 sides are all planted in the shed. In the middle row, the adjacent two plants are reversed to facilitate the distribution of stems and leaves in the shed. When planting should be selected for continuous 3-5 sunny days at noon, the field should maintain 7-10 cm water layer, not boring tip is appropriate, after the child should be slightly higher, was inclined. Sixth, the growth of management 1, temperature management. After 3-5 days of planting, the temperature of the shed should be raised to keep it at 33-38°C during the day, 16°C or more at night, and the water depth is 7-10cm. Axillary buds can be basically released after 2 weeks. During this period, attention should be paid to nighttime heat preservation, keeping the temperature at 25-30°C during the day and 15°C or more at night. In early May, precautions should be taken to prevent high-temperature stuffy sheds, while the shed film is often scrubbed to increase light. To ensure normal temperature, early release, or prolong the release time, in order to facilitate growth. By the time of vigorous growth, the temperature should be kept at 25-30°C during the day, 15-18°C at night, and not less than 12°C. In mid-May, when the night temperature stabilizes at 15°C, the film can be removed and ventilated overnight to facilitate sitting. 2, water and fertilizer management. The water level during the growth period of lotus root should master the principle of "shallow-deep-light". The 7-12 cm water layer is maintained at the beginning of fertility, and as the plants enter a vigorous growth period, the water level should be gradually increased to 20-30 cm to meet the growth; when the child's leaf is about to begin to recuperate, it gradually decreases to 10- 15 cm to facilitate the coupling. When the humidity of the air becomes small, sprayer can often spray fresh water into the air. 2 main fertilization: the first time the plant expands 2-3 leaves, apply 45 kg of compound fertilizer per acre or 180 kg of cooked cake, and consider the plant growth potential to add 5-8 kg of urea. The first time around the first time, about 1 week before the children's leaves were flattened, when some of the lotuses were about to open, it was 20 kilograms of urea per acre. Every time you top-dress, put the water in shallow water and restore the water level after 4-5 days. In addition, the topdressing must be carried out after the dew has dried. After the recovery, the sprayer should be used to spray water to clean the lotus leaf in the pool. The concentration of the top dressing should not be too large. Pay attention to reduce the number of exchanges of water in the shed, and it is even more inappropriate to drain immediately after fertilization. Not changing the water in the shed during the entire growth period is the best measure to increase production. 3, other management. To weed the grass early, after the closure of the plant into the vigorous growth period, the underground early scab began to scab, it is not appropriate to manual weeding, chemical weeding. Over 40 days after planting, the floating leaf should be removed in time. In addition, lotus root is used for the purpose of coupling, and the pedicel should be twisted in time when the buds will appear, but it must not be broken to prevent rain from invading the stomata to cause rot. Into the growth of the lotus whip growth faster, when the leaves close to the edge of the field, the coupling should be promptly pulled inwards, known as the coupling head or "back chant." Usually every 5-7 days 1 time, the growth peak once every 2-3 days, until about 1 week before harvest can be stopped. VII. Pest control. Diseases and insect pests in the growing stage of lotus root are generally not serious. In the first few months of May, some sheds will find locusts and lighter brown spot disease. They can use 20% Davisley EC 3,000 times, or 20%, to control locusts again by net 2000 times. Mancozeb 600 times or 75% chlorothalonil 600 times as early as early spraying, early detection and prevention, prevention and control once every 5-7 days, generally 2-3 times can be effective. Eight, harvest. In the middle and early July, the open field began to sit down, and when the emergence of the leaf was stopped, the market could be dug up. It was a time when the market was short of fresh produce and the production efficiency was considerable.

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