Sweet potatoes need to be nursed 2 months before transplanting, that is, spring potatoes should be nursed in late January, autumn potatoes in mid-to-late June, and early winter potatoes in early to mid-August. The seedlings can be raised in one time or propagated in batches.
Corresponding planting season and time of sweet potato seedlings:
Spring sweet potato: late March to early April.
Autumn sweet potatoes: around mid to late August.
Winter sweet potatoes: around early to mid-October.
Mid-April is the right time for seedling transplanting. At this time, the temperature in early spring is basically stable all year round. The right time for seedling planting is when the ground temperature reaches 15°C or above 10 cm after the end of the late frost. You can start planting seedlings last year. Plow and dry the soil early in winter or early in the year, and then make ridges and trim the borders during planting. The width of the border is 50cm. In early and mid-April, seedlings are cut and transplanted according to the emergence speed of the seedbed. Line-level insertion is used to increase the number of potato seedlings inserted into the soil to increase the number of potatoes. Plant 3,500-4,000 plants per acre, with a spacing of about 33cm. Cultivation and management of sweet potato seedlings
1. Adjust light: Sweet potatoes like light. When there is sufficient light, the leaf color is thicker, the leaf age is longer, the stems and vines are thick, the conductive tissue of the stem is developed, and the yield is higher. high. However, sweet potato seedlings do not have high requirements for sunlight, because the fence is always covered with plastic tarpaulin, which is only uncovered in the later stages when the temperature is already high.
2. Control humidity: Sweet potatoes are drought-tolerant crops, but too much or too little water is not conducive to increasing production. The growth of sweet potato seedlings requires better control of moisture. If the moisture is too little, the sweet potatoes will be cooked due to excessive temperature. If the moisture is too high, ventilation and sunlight should be provided. In short, the dry humidity of the soil must be constantly observed and strictly controlled at around 50%.
3. Temperature control: The most suitable temperature for the growth of sweet potato seedlings is 20 to 25 degrees. If it is lower than 20 degrees, increase the burning of firewood and cover it with plastic tarpaulin. When the temperature is higher than 25 degrees, use less firewood, and you can also remove plastic tarpaulins to increase ventilation and cooling. Generally speaking, the fire is started in early February and burned for about an hour in the morning and evening every day. The fire can be stopped after 15 to 20 days, and the influence of temperature is basically small.
4. Crushed soil promotes growth: Sweet potato seedlings begin to dig out of the soil layer after about 15 days under conditions of good sunlight, temperature, and humidity control. Due to the dense potato pieces, it seems that the entire site seems to be elevated. of. At this time, wooden boards should be put up on the fence, and people should stand on it, carefully lift up the soil, crush it with hands, and spread it evenly. This can reduce the pressure on the potato seedlings when they grow, and is also conducive to moisture conservation and conducive to The growth of potato seedlings.
5. Temperature difference control: Sweet potato seedlings grow fastest at night, but due to the large temperature difference between day and night, plastic tarps should be covered tightly at night, and a layer of grass mats can be spread to prevent the temperature from dropping. Too fast is not conducive to the growth of potato seedlings.
6. Timely picking: After the sweet potato seedlings become seedlings, put the wooden boards on the fence. When picking, people stand on it and pick carefully. If the potato seedlings turn yellow, it will affect the sales of the potato seedlings. You can spray Pesticide "sprays green" to make it green.