Planting time and method of sweet potato

The planting time of sweet potato is from February to March in the south and from the end of April to the beginning of May in the north. Planting method: the soya bean can be planted in loose sandy soil, deeply turned over and applied rotten farm manure, ploughed again to make it mixed evenly, and then selected the seeds of good quality for sowing, inspected the seedling situation from May to June, and replenished the seedlings in time. After the seedlings were unearthed, the seedlings should be shoveled in time, potassium dihydrogen phosphate could be sprayed at the pod filling stage, and growth regulators could be applied at the same time.

First, the planting time of sweet potato

The main results are as follows: 1. it is suitable to sow in the middle of February-March in the south, from the end of April to the beginning of May in the north, and from March to the end of April in the Yangtze River basin.

2. When sowing, the ground temperature should be stable above 15 ℃, and it can start sowing for about 5 days in a row to prevent rotten seeds and dead seedlings. If the temperature is lower than 11 ℃, it is not suitable to sow, so the bean will not emerge, thus affecting the yield in the later stage.

Second, the planting method of sweet potato.

1. Soil preparation and fertilization

The main results are as follows: (1) ground bean is a kind of economic crop, which should be planted in loose sandy or oil sandy soil.

(2) after selecting the planting site, the soil can be turned deeply, and then about 30-40 tons of rotten farm manure can be applied per hectare, and then ploughed, so that the fertilizer and soil can be mixed evenly, and if conditions permit, water can be applied first. then mix chemical fertilizer and agricultural fertilizer evenly into ridges and ditches, and finally ridging and suppressing can be sown.

2. Select varieties

The main results are as follows: (1) if we want to have high yield, we should choose suitable good varieties to plant. The varieties with high yield are Jifu series varieties and Fuhua series varieties respectively, and the growth period is about 110-120 days.

(2) the pods with undamaged, large and full fruit and neat shape should be selected as seeds before planting, and the selected seeds should be dried for about 1-3 days, then shelled and further screened, and the seeds with neat shape and pure color should be selected as seeds.

3. Rational fertilization

The ability of resistance to barren is relatively strong, first of all, sufficient basic fertilizer can be applied to about 30 tons of farm manure per hectare, together with about 300-400 jin of diammonium phosphate. If soybeans are planted in barren areas, about 200-300 jin of urea should be applied per hectare.

4. Replenish inter-seedling

Generally, sown beans can inspect the situation of seedlings in the field from the end of May to the beginning of June. if the lack of seedlings is found, the seedlings should be replenished in time, and the seedlings and fixed seedlings can be carried out by sprouting and sitting in water.

5. Qinggu squatting seedlings

After all the seedlings are complete, pull the soil around the seedlings by hand around the 2cm, and then gently pull out the two cotyledons. Generally, the squatting seedlings can be cleared about 3 days after the first shovel.

6. Shovel in time

Generally, you can start shoveling after the seedlings are unearthed, about 3 days after the shovel, and the second shovel is 15-20 days later, you must cultivate the soil in time, not press the seedlings, wait until the end of the flowering period, you can shovel the third time, in order to facilitate the fruit needle to pierce the soil, in order to seal the ridge, you should go through the square ridges and remove the weeds in time.

7. topdressing at the right time

In the podding and satiety stage, 0.3% potassium dihydrogen phosphate can be sprayed on the leaf surface according to the growth of the plant, and plant growth regulators such as Lvfeng 95 can be applied at the same time, which is beneficial to promote grain formation.

8. Timely harvest

It is generally harvested in mid-September, and when the bean leaves turn yellow and part of the stems and leaves become dry, they can be harvested.