First, planting time
Promptly insert early and increase production. The minimum growth temperature of potato roots is 15°C, so production should be controlled with an air temperature of 18°C ​​for planting. It is usually planted in late April and will be inserted in late May. The best choice for planting is when cloudy soil is dry or not wet. When sunny temperatures are high, it is appropriate to plant in the afternoon. It is not appropriate to plant sweet potatoes after heavy rain, which is easy to form wood roots. It should be raining and it should be planted when the soil moisture is suitable. It is also not suitable for irrigation after planting, irrigation after planting or planting after heavy rain, and the survival rate is high. However, the long-term growth of potato plantlets is not good due to the fact that the soil is in a state of water saturation and the soil temperature is cold, and the soil is also changed. To be tight, the oxygen content in the soil is reduced, hindering the development of the root system and slow growth. Long drought and lack of rain, you can consider the drought-resistant planting, digging water, until the water is dry covered with thin soil, after planting seedlings stepping solid, so that the roots and soil in close contact, early to survive. If water is poured after transplanting, it needs to be covered with dry soil moisture.
Second, cut the seedlings
Shearing time depends on planting time, general seedling height 20-25cm cutting seedlings. When cutting the seedlings, the potato seedlings must be cut in two sections on the ground. Generally, five sections are cut and inserted with the scissors.
Third, a reasonable close planting
Sweet potato planting density should be determined according to variety, soil fertility, fertilization level and planting methods, short vinegar inlay density generally about 4000 acres inserted; long vines oblique plug should be thin, generally inserted 2500-3500 strains, plant spacing is generally about 25cm .
Fourth, planting methods.
Summer sweet potato planting methods are mainly the following two:
1 line plug
When the soil was wet after the rain was soaked, the potato seedlings were short, only 4-5 nodes, and the potato seedlings were immersed in 2-3 nodes vertically and exposed 1-2 nodes. The advantage is that the seedlings are deep, they can absorb the lower layers of water and nutrients, they can resist drought and rot, they have high survival rate, and they are planted with labor. The disadvantages are that the soil in the lower section is too deep, the ventilation is poor, there are few potatoes, and there are not many soil sections. There are fewer potatoes.
2 oblique interpolation
High-yielding cultivated sweet potato generally adopts oblique insertion method. It is required that the potato shoots have 5-7 sections and be 2-3 sections of soil, exposing 2-4 sections. The advantage is that the number of tubers per plant is increased, and the near soil surface is easy to form big potatoes. The disadvantage is that the drought resistance is slightly inferior to the line insertion.
After the summer sweet potato was transplanted, it was mixed with 1 to 5 kg of 10% phoxim particles and 10 kg of fine soil to form a poisonous soil for the control of nematodes and silkworms in the soil. About 10 kg per mu, about 2 grams per hole.
Fifth, check seedlings to make up for shortage
After the sweet potato is inserted, the lack of dead seedlings is often caused by drought, pests, or improper planting. Therefore, in the 3-7 days after the insertion, it is necessary to check the seedlings in a timely manner and implement key management on the planted potato seedlings to catch up with the previous seedlings.
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