First, planting time
1, March and April in spring
Sweet potato planting season is in March and April in spring. Because it is generally warm, humid and rainy in spring, the temperature is generally above 20℃, so sweet potato buds and new branches grow vigorously.
2. Autumn potatoes in mid-June.
Sweet potatoes should be nursed back to health two months before transplanting, that is, spring potatoes should be nursed back to health in late June, autumn potatoes should be nursed back to health in late June and winter potatoes should be nursed back to health in early August. Spring potatoes can be transplanted when the ground temperature is stable at 12 degrees, and it will be around 1 in North China in May. After the wheat harvest, at about the beginning of June, make summer potatoes immediately.
Second, the planting method
1, sweet potato seedling selection
Selecting high-quality sweet potato seedlings can increase the yield, bear potatoes early and have strong disease resistance. Sweet potato seedlings generally have short internodes, three to five, and their height is 20-30cm.
Step 2 make a hole
When planting sweet potatoes, you should dig holes, each hole can be 30-60 cm apart and the depth is 3 cm from the base of the plant to the root of the tuber.
3. Planting method
Put the sweet potato seedlings into the pre-dug caves one by one, and cover the stems with about 1.5cm soil. The leaves of sweet potato will grow vines, while the roots will grow tubers at the depth of 15-30cm in the soil.
Step 4: Cover the film.
Plastic film mulching can protect sweet potato in cold weather, prevent excessive growth of sweet potato vines and rob tubers of nutrients.
water
Sweet potatoes need a lot of water when they are first planted. In the later period, with the growth of sweet potato, watering should be reduced, and watering should only be done once a week in the later period. Start watering every day, and then reduce the number of watering times every week.
Introduction of sweet potato seedling raising methods;
Potato root seedling method has the characteristics of making full use of space and large seedling quantity, and potato root can also harvest a certain yield of sweet potato in spring. Using this method to raise seedlings, the temperature in the greenhouse or balcony should be controlled between 5-25℃, not too high or too low. Generally, 400-600 sweet potato seedlings can be cultivated per square meter.
Potato vine seedling raising method is to select healthy potato vines without frost and disease after harvesting in autumn, remove leaves, keep petiole 1 cm, and cut one section every two sections to form potato vine sections. The subsequent operation method is the same as potato root seedling raising method.
The above three sweet potato seedling raising methods have the characteristics of low investment, easy management and low cost, which can not only turn waste sweet potato vines and roots into valuables, but also save a large number of seed potatoes, eliminate the rot loss of seed potatoes in the cellar, save the land occupation of seed potato seedling raising and field management during seedling raising, and have obvious economic benefits, which is especially suitable for small-scale implementation in farmers' families.
Baidu encyclopedia-sweet potato seedlings