Sweet potato is also called sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, goose, sweet potato. Panicum miliaceum has round, oval or spindle-shaped tuberous roots in the underground part, the stems are recumbent or ascending, occasionally twining and multi-branched, and the shape and color of leaves often vary with different varieties. Usually, they are broadly oval, with different petioles. Cymes are axillary, and the capsules are oval or oblate, with 4 seeds 1-4, usually 2, and hairless.

Sweet potatoes are native to South America and the big and small Antilles, and are widely cultivated in tropical and subtropical regions all over the world, and are widely cultivated in most parts of China.

Extended data:

1, temperature

Sweet potato likes temperature, is afraid of cold and is not cold-resistant. The suitable growth temperature is 22-30℃, and it stops growing when the temperature is lower than 15℃. Different growth stages have different requirements on temperature, and the temperature in bud stage should be 18-22℃. Too high or too low temperature will affect the germination rate.

The temperature at seedling stage should be 22-25℃, at stem and leaf stage should be 22-30℃, and the temperature at stem and leaf stage should not be lower than 16℃, otherwise it will hinder its growth or even stop growing; If it is lower than 8℃, it will cause the plant to wither and die by frost. The temperature of root block stage should be 22-25℃. Appropriate temperature can promote the growth of plants in each growth period and ensure the rapid number and expansion of roots.

2. Lighting

Sweet potato likes light and is a short-day crop. Plant growth requires high light energy, which is a crop that is not tolerant to shade. From the stem and leaf stage, the growth period of light energy is long, and the photosynthetic efficiency is higher. Otherwise, it will reduce photosynthetic efficiency and affect plant growth.

The sunshine time should be 8- 10 hour every day. Adequate sunshine can not only promote flowering and root formation, but also make more nutrients accumulate on the root and promote root swelling.

3. Moisture

Sweet potato has strong adaptability to drought, the soil water capacity should be controlled at 60-70%, and the suitable water conditions can meet the needs of different growth periods. The soil water-holding capacity should be 60-80% in bud stage, seedling stage, stem and leaf stage, branch and potato-bearing stage, etc. Too low water-holding capacity will cause the slow growth of roots, resulting in the emergence of weak seedlings, short seedlings and diseased seedlings; The soil water holding capacity should be 60-70% at the root stage.

4. Soil

Sweet potato has good acid and alkali resistance and strong adaptability to soil environment. Its root system is developed and its ability to absorb fertilizer is strong, so it is appropriate to choose a plot with deep soil layer, loose soil, good soil quality, strong irrigation and drainage ability and pH value between 4.2 and 8.3.

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