Planting time and method of white sweet potato

White sweet potato, also known as "sweet potato", uses part of the fat root, its skin is thin and tough, the meat is white, tender and crisp, sweet and juicy, eating without residue, and slightly fishy smell of beans, raw or cooked food has the effects of invigorating body and relieving thirst, cooling and relieving heat, relieving alcohol and detoxification, lowering blood pressure and so on. Widely cultivated in our country, the following editor will introduce the planting time and methods of white sweet potato.

1. Planting time of white sweet potato

As the growing period of white sweet potato is long, we should strive for early sowing as far as possible. generally, early-maturing varieties are sown in March and late-maturing varieties are sown from April to June. It is generally required that the average temperature is more than 12 ℃ for sunny sowing.

2. Planting methods of white sweet potato

1. Land selection and preparation

Select sandy loam soil with high topography, good drainage and loose and fertile soil, and apply sufficient organic fertilizer before planting.

2. Soaking seeds to accelerate germination

White sweet potato seeds are hard, dry seeds germinate slowly but not neatly, and sprouting is often used in production. Seeds should be carefully selected before budding, and seeds that are old, full and fresh should be selected. When accelerating germination, soak the seeds for 10-12 hours, absorb water and expand, then put them in a 25-28 ℃ incubator to accelerate germination. Take out and rinse once a day. After 4-5 days, the germinated seeds are selected and sowed for 2-3 times.

3. Sowing method

Soybeans are generally used for direct seeding, and the sowing methods can be divided into two types: climbing cultivation and support cultivation. Generally, the row spacing is 50 cm, the plant spacing is 33 cm, and 1-2 seeds are sown in each hole. 3000 plants can be planted per mu, and the amount of seed used is about 2 kg. The support cultivation adopts deep trench and high border, the height of the border is 20-25 cm, the width of the ditch is 50 cm, the surface of the border is 90 cm, 2 rows are planted on each border, the spacing between rows is 50 cm, the distance between plants is 33 cm, 3-4 seeds are placed in each hole, the amount of seeds per mu is 2.5-3 kg, and the cover soil is 2-3 cm after sowing. Seedlings can emerge 15 days after sowing.

4. Replenish seedlings with inter-seedlings

The seedlings were unearthed 15 days after sowing. After the appearance of the first pair of basal leaves, 1-2 seedlings were left in each hole, and 1 seedling was fixed at last. The seedlings should be replenished in time, and the seedlings should be transplanted with soil masses on a cloudy day.

5. Ploughing and weeding

Before the seedling height 7 cm to the side vine paving, we should grasp the middle ploughing and weeding, the middle ploughing should be shallow, do not hurt the roots, and the fleshy roots can be cultivated 4-7 cm in order to avoid exposing the fleshy roots outside the soil, the color will turn green and the quality will become bad, but we must not cultivate the soil too deeply, and the tuber roots are easy to grow.

6. Water and fertilizer management: loosen the soil and topdressing in time at the seedling stage, loosen the soil every time, irrigate human feces and urine to promote its early development, and re-apply topdressing when the root expands in the first and middle of June. In case of drought, should pay attention to watering; in case of heavy rain should be timely drainage, if there is waterlogging in the field, it is easy to lead to sweet potato skin brown or root rot, affecting its yield and quality.

7. Beating flowers and picking hearts

Sweet potato begins to draw inflorescences in 5-6 nodes, and then with the elongation of the vine, almost every node inflorescence, if it blossoms, the pods are wasted and nutrients are wasted, and the roots are not easy to be hypertrophic. Therefore, in addition to those who want to keep seeds, as soon as the inflorescence occurs, it should be cut off immediately and retain its leaves for photosynthesis, up to 2-3 times; when the main vine is 18-24 leaves, the vine stops growing.

8. Pruning and framing

When the sweet potato seedlings grow to 30 cm high, insert a small mangosteen or cotton stalk in each hole, build a herringbone frame, tie the adjacent sweet potato seedlings together and let the vines climb onto the shelf.

Finally, we should also pay attention to timely harvest. Early-maturing sweet potatoes can be dug up and eaten in May or June, while medium-ripe ones are usually August or September.