First, planting time
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Early insertion in time to increase production. The minimum growth temperature of potato roots is 15 °C, so the temperature should be stable through 18 °C. General planting in late April to fight insert finished in late May. It is best to choose the cloudy soil when it is not dry or wet. When the temperature is high on sunny days, it should be planted in the afternoon. It is not advisable to plant sweet potato after heavy rain, which is easy to form. It should be rained and the weather should be replanted when the soil moisture is suitable. It is also not advisable to plant water after planting, planting water after planting or planting after heavy rain, and the survival rate is high, but the potato seedlings tend to grow poorly for a long time because the soil is saturated with water and the soil temperature is cold. At the same time, the soil also changes. It is relatively tight, and the oxygen content in the soil is reduced, which hinders the development of the root system and slow growth. For long droughts and lack of rain, you can consider drought-resistant planting, digging and pouring water. After the water is dry, cover the soil with thin soil. After planting the seedlings, step on the ground and let the roots come into close contact with the soil to survive early. If the water is sprayed after planting the seedlings, it is necessary to cover the soil to moisturize.
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Second, cut seedlings
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Shear seedling transplanting time with the time to look for the general height 20 - 25cm cut seedlings. To cut off when the potato seedlings in the seedling flat cut two nodes, generally cut section 5, with shear plug.
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Third, reasonable close planting
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Sweet potato planting density should be based on variety, soil fertility, fertilization and Planting system determination, the short vine-line density is typically about 4,000 mu interpolation; vine long slant to dilute, generally inserted 2500--3500 strain spacing is generally about 25cm .
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Fourth, the planting method.
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There are two main methods for planting summer sweet potato:
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1 inline
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After the next soaker soil when wet, short Cutting of only 4 - 5 sections, Cutting of the vertical buried 2--3 sections, there exposed 1 - 2 section. The advantage is that the inserted seedlings are deeper, can absorb the lower layer of water and nutrients, can resist drought and sputum, have high survival rate, and plant labor saving. The disadvantage is that the lower section is too deep into the soil, the ventilation is poor, the potato is less, and the soil festival is not much, the single plant knot The number of potatoes is small.
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2 oblique insertion
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High-yield cultivation of sweet potatoes is generally carried out by oblique insertion. Cutting of long or claim 5--7 sections, there buried 2--3 sections, there 2 is exposed - 4 sections. The advantage is that the number of potatoes per plant increases, and the near soil surface is easy to form large potatoes. The disadvantage is that the drought resistance is slightly worse than the straight insertion.
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After the summer sweet potato is planted, it is mixed with 10% phoxim particles 1-1.5 kg and 10 kg of fine soil to make toxic soil, which is used to control the nematodes and soilworms in the soil. The dosage per acre is about 10 kilograms, and the dosage per hole is about 2 grams.
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V. Check the seedlings to fill the gap and ensure the whole seedling
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After sweet potato is inserted, the phenomenon of dead seedlings is often caused by drought, pests or diseases, or improper planting. Thus, after inserting 3--7 sky is filled seedlings timely investigation of potato seedlings Planting monthly to the implementation of key management, catch up with pre-emergence.
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Source of information: Agricultural Bureau of Wuyuan City, Hunan Province
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