Sweet potatoes are familiar to everyone. They are common food crops in rural areas. They are commonly known as sweet potatoes. In the past, every household will plant a little. Especially in the winter, eating a hot roasted sweet potato is very delicious. Sweet potatoes are not only the whole body of the stems, the leaves are edible, but also the role of preventing anemia. The old people call it "longevity food." The demand for sweet potatoes is also gradually increasing. How to cultivate sweet potatoes in greenhouses? First, the variety selection Choosing seed potatoes and cultivating strong seedlings are the basis for high-yield cultivation. Sweet potato is vulnerable to virus damage and causes degradation. According to different uses, it should be of high quality, high yield, resistant to pests and diseases, strong adaptability and good commodity performance. Do not use old varieties that have been planted for many years, and do not use genetically modified varieties. Second, the seedbed preparation 1, seedbed specifications Should choose a higher terrain, shelter from the wind to the sun, 3 to 5 years have not planted sweet potatoes in the greenhouse to do seedbeds, before the seedlings ploughed, flattened, fine, to grow 7m, width 1.2m Yangshuo. 2, nursery time Mid-February - early March. Third, seedbed management 1. Warming before potato removal In front of the potato, 3 to 4 sky uncovers the cover and warms the greenhouse, so as to warm the potato. 2, potato The potato should strive to achieve the standard of "separate size, head and tail, face up, face down, face up and down". After planting, the soil should be watered before the soil is covered. After the watering, the soil should be finely soiled. The soil should be thin, and the thickness should be 2-3cm above the soil of the seed potato. Adding a layer of plastic film on the seedbed can increase the bed temperature 2-3. °C, but it should be noted that the film can not be attached to the seedbed too tight, otherwise it will affect the emergence or rotten potato. 3, temperature Before the buds are germinated, they should be germinated at high temperature, and they should be warmed up and warmed up, and strive to produce seedlings, seedlings, and seedlings. After the potato buds are unearthed, the temperature should be properly lowered. If the temperature is too high, the two ends of the film bed should be unventilated at the noon and closed in the evening to avoid burning the seedlings. When the temperature is stable at 20 ° C, the film is completely uncovered, and the night cover is exposed. Scientific management of seedbeds. Comprehensive use of temperature, moisture, oxygen, fertilizer and other conditions, according to the requirements of different growth stages of potato seedlings, reasonable grasp of high temperature germination (30 ~ 35 ° C), medium temperature long seedlings (25 ~ 30 ° C) and low temperature refining (20 ° C) The principle is to reach early seedlings, seedlings and seedlings. Repeat the above process for each shot. In the germination stage of potato chips (before seeding and seedlings are unearthed), it is required to promote the bed temperature to maintain a suitable range of 30-35 °C, and promote early "explosion" and more germination. The core of the management is to increase the temperature and keep warm, while paying attention to the humidity of the seedbed. The surface is required to be wet and the film is covered. In this period, the intra-membrane space should be warmed up by solar energy as much as possible, which can promote early emergence. In the good weather, the temperature inside the membrane can reach above 45 °C (this time should pay attention to temperature control, not more than 38 °C is appropriate). In case of high temperature, the insulation can be shaded. Cultivate the strong seedling stage (before the potato seedlings are unearthed until the seedlings are harvested), and it is required to ensure that the potato seedlings grow fast and robust. On the basis of the urging, the seedlings should be tempered and refining. The bed temperature should be maintained at 25 to 30 °C. In addition to cold current, low temperature, rain and snow, it should be exposed as much as possible during the day to fully see the light, but pay attention to the temperature change in the film at noon on sunny days, do not exceed 40 °C to prevent burning. On a sunny day at noon, when the temperature is higher than 16 degrees above sea level, the insulation can be lowered from 12 o'clock to 2 o'clock. As the seedling volume increases and the temperature rises, the amount of water should be increased to keep the bed soil moist. When the potato seedlings approach the standard height (20 to 25 cm), the seedbed management is transferred to the main stage of refining. At this time, the heating and watering should be stopped. From the daytime, the grass curtain is not covered, and the film is gradually opened to release the air, so that the bed temperature is lowered to about 20 °C, so that the seedlings can be exercised, and the seedlings can still grow. The seedling stage of early seedlings should be cycled alternately according to the above-mentioned methods to promote multiple seedlings and make each seedling grow robust. This has a significant effect on improving the breeding coefficient of improved varieties and improving the efficiency of seedlings. 4, humidity The soil moisture of the bed should be kept at around 75%, see dry and wet. 5, refining After the potato seedlings are out, choose sunny day to gradually ventilate and cool down. After the seedling height is 10cm, it will be ventilated day and night to carry out low-temperature refining to adapt to the conditions of field planting. 6, seedlings Cut the seedlings in time. When the potato seedlings grow to a sufficient standard, they should be harvested in time. Otherwise, the potato seedlings are crowded, and the ventilation and light transmission are poor, which will cause the lower leaves and seedlings to yellow, which not only affects the quality of the potato seedlings, but also reduces the number of seedlings. Seedlings should be cut with scissors, cut large and small, and high shearing seedlings (3 cm from the bed surface, retain 1 to 3 leaf nodes). Does not damage the seedlings and leaves, is conducive to the retention of early seedlings, increase the amount of seedlings. Adjust the seedling strength according to the density of the seedbed. In early April, when the potato seedlings grow to about 20cm, they should be harvested in time. If the seedlings are too late, the lower seedlings will be damaged and the number of seedlings in the lower layer will be affected. Fourth, fertilization management Fertilize and water after each seedling. 5 kg of urea + 400 g of potassium dihydrogen phosphate on a 400 m2 greenhouse. Foliar fertilizer is sprayed regularly for 5-7 days. Five, strong seedling standards The standard of strong seedlings is mainly thick stalks, short internodes, thick leaves, top three leaves flush, seedlings 20 to 25 cm long. Hundreds of seedlings weigh more than 0.5 kg, suitable for old and tender, with more juice and no pests and diseases. The weight of spring potato is about 500 grams. Six, potato seedling treatment Use 50% carbendazim 500 times solution or 70% methyl thiophanate 500-700 times solution plus 50% phoxim 300 times solution and dilute mud to soak the base of the seedling for half an hour, and put it in the shade. The above is the cultivation technology of greenhouse sweet potato in Xiaonong. The farmers have planted sweet potato. The management of seedling stage is the most important. Therefore, farmers must master the above cultivation techniques. I hope the above can help. To the farmers who grow sweet potatoes. For the wonderful pictures and hot comments on sweet potato cultivation in greenhouses, you may be interested in the following recommended contents. Welcome to read. White Garlic,caulk white garlic,Best White Garlic,White Garlic For Sale shandong changrong international trade co.,ltd. , https://www.cragriculture.com
.jpg "Detailed cultivation techniques of sweet potato in greenhouse")
