ready. Seedlings are generally sunny in the middle and late March, and they choose leeward and sunny, high dry terrain, good soil permeability, rich organic matter, and easy management of sandy soil or sandy loam. The seedbed is 1.2m wide and 20-30cm deep, depending on the garden. Mushi manure excrement 1O-15 Tam, through the soil after suction dried to drain the potatoes.
Line up. When the temperature reaches around 15 degrees, the purple sweet potato seeds are discharged on the seedbed, generally about 18 kg of seed potatoes per square meter, with the back facing up, the head slightly higher, the mud at the tail, the head and tail in the same direction, and the mulching bar is used again. 1O-15 tam, evenly cover the top of the seed potato, covering 1.5-2cm fine soil, and then cover the film, compacted with fine soil around.
Seed management. Seedbed management is mainly focused on heat preservation, moisturizing, ventilation and other measures, mainly based on temperature. Before the emergence, cover the grass curtain at night and keep the bed temperature 25-35°C. After the emergence of temperature control at 20-25 °C, to prevent high temperature burning, such as the film temperature exceeds 30 °C, to timely ventilation and heat to prevent burning seedlings. When the cold wave comes, we must do a good job of insulation. Seedlings generally do not water before emergence, in order to facilitate high-temperature germination, disease prevention and emergence. If the seedbed is too dry, use a sprayer to spray water on the seedbed. After emergence, attention should be paid to the humidity of the seedbed. When the seedbed is white, it must be watered in a timely manner, moisten the bed soil and dilute the rare human urine to promote the growth of the potato seedlings. Fertilizer will be fertilized after seed germination. For the first “red bud†period, thin human urine is generally preferred; when the height of the seedling is 10-13 cm, a second topdressing may be performed and human urine or urea may be topdressed. After each fertilization, the seedlings should be poured with clean water to prevent the fertilizer from adhering to the seedlings and cause the phenomenon of burning seedlings. The soil can be divided into 2-3 times. The height of the seedling is about 10 centimeters, and the soil can be cultivated for the first time. The second time is performed every other week, and the soil is 3-5 centimeters. It is best to use fertile loose soil to mix coke ash or decomposed compost, spread evenly into the seedbed. Soil can be combined with the application of liquid fertilizer, so that the first fertilization after soil fertilization, so that the soil and the seedling base closely integrated, in order to facilitate early hair, and more new roots.
Protein series
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