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I. Selection of land and land preparation
Choose sandy soil with less weeds and light salinity, fine land preparation in autumn, combined with 150-200 kg of straw per acre in autumn, 4000 kg of high-quality farmyard manure, and timely cultivation and protection in winter and spring.
Second, nursery
1. The construction of the seedbed adopts the fire seedling method. The area of ​​the seedbed is generally 6 square meters, and the size of the seedbed can also be determined according to the amount of seedlings. The location must be chosen to avoid the wind and the sun. The seedbed sits north to south, leaving a fire pit door to the south and a chimney to the north for heat preservation and heating.
2, select the seed potato to choose high-yield high-quality "868" sweet potato as the mother species, each mu of field needs 2 square meters seedbed for seedling, must prepare 200 seed potatoes, about 50 kg.
3, sand disinfection will be prepared fine sand to the top of the fire pit, thickness 3-4 cm, the sand is poured through the water to disinfect, until the sand is cooled and ready to plant.
4. Sowing around April 5, the selected seed potatoes are erected on the sand of the bed, the seeding rate is 25 kg per square meter, the seeding density is 100 seed potatoes per square meter, and then disinfected with boiling water. The cooled sand is covered on the seed potato. The sand is 3 cm higher than the top of the seed potato. The top of the seed is covered with agricultural film, and the agricultural film is pressed on four sides to keep warm.
5. Warm up the fire pit on time to keep the temperature inside the membrane bed at 18-25 °C.
6. After watering and emergence, according to the dryness and wetness of the sand, it is necessary to sprinkle water on the bed surface in time to ensure that the soil has sufficient humidity to facilitate the emergence of seedlings and seedlings.
7. Refining seedlings according to the age and temperature of the seedlings, timely uncovering the film and venting the seedlings, the temperature inside the film can never exceed 25 °C, avoid burning the seedlings, prevent the lengthening, cultivate strong seedlings, and the leaf age is three leaves and one heart when planting, the seedling height 15 cm is suitable, and the seedlings that are bred can be picked 2-3 茬.
Third, preparation before planting
1. Applying soil to prevent underground pests from plowing the ground, use 200 ml of phoxim per acre, and mix 15 kg of fine soil into the field to prevent the tigers, golden worms and cockroaches.
2, when applying the base fertilizer to plow the ground, apply 25 kg of diammonium per acre of land and 10 kg of potassium sulfate. If there is no field for fertilization in autumn, spring application of high-quality farmyard manure 4000 kg, turn into the ground 20 cm, and smooth.
3, ridge ridge width 30 cm, ridge height 30 cm, groove width 20 cm, ridge width and height should be uniform.
Fourth, the plantation of
1. The planting method should be filled with water before planting, and the water depth should not exceed the top of the ridge. When the water seeps 2/3 of the ditch surface, it is planted in the lower ditch of the rain boots. The method is to insert the planting method. That is, after the artificially harvested seedlings are manually picked, the sweet potato seedlings are taken in the left hand, the right hand is bent at 90 degrees about 5 cm in the potato seedlings, and the depth is 3 cm deep from the top of the ridge surface, and then the finger pit is pressed to the soil, and 5-- Refill water once every 7 days.
2. The planting density is 25-30 cm, the row spacing is 50 cm, 1 seedling per hole, one row per ridge, 4500-5500 plants per mu.
V. Field Management
1. The cultivating and cultivating soil shall be cultivated and weeded twice in time before buds, and the ridges shall be widened appropriately.
2. According to the growth amount of the topdressing and watering, the amount of ammonium carbonate is 30-40 kg. The method is to apply a small shovel at a distance of 5-7 cm from both sides of the ridge surface, and then fill the water. In the middle stage, the water is properly irrigated according to the dry and wet conditions of the soil, and the latter is not suitable for irrigation.
3, foliar fertilization If the color of the leaves has yellowing, it should be sprayed with potassium dihydrogen phosphate in time, 100 grams per mu.
4, topping the rattan in order to prevent the vine rooting, should promptly pull the vine, when the growth is too strong, you should pick the heart to promote tuber expansion.
5. When pests and diseases are detected and infected, brown spot disease is sprayed with 100 g of methyl thiophanate or 100 g of mancozeb per 100 ml of water.
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