The best planting season for sweet potatoes is spring in March and April, because this period of time in the spring is generally warm and humid and rainy, with temperatures generally above 20 degrees Celsius, and the shoots of sweet potatoes grow vigorously.
Sweet potatoes need to be transplanted and planted 2 months before seedling, that is, spring potatoes in late January to start seedling, fall potatoes in June in the middle and late seedling, early winter potatoes in August in the middle of seedling.
Spring potatoes can be transplanted when the ground temperature stabilizes at 12 degrees Celsius, around May 1 in North China; summer potatoes immediately after the wheat harvest, around early June. Sweet potato is one of the high-yield and stable crop, it has wide adaptability, strong resistance, drought and barren resistance, fewer pests and diseases, etc. It is planted in places with better water and fertilizer conditions.
Expanded Information:
Growth habit
Warmth-loving, fear of cold, intolerant of cold, suitable for the growth of the temperature of 22-30 ℃, the temperature is lower than 15 ℃ to stop growing. Different growth periods have different temperature requirements, the bud stage temperature should be 18-22 ℃, the temperature is too high or too low will affect the rate of germination.
The temperature in the seedling stage should be 22-25 ℃, the temperature in the stem and leaf stage should be 22-30 ℃, the temperature in the 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 the root mass period should be 22-25℃. Appropriate temperature can promote the plant to grow well in all growth periods, to ensure the number of root fast and expansion.
Good acid and alkali tolerance, soil environment adaptability. Its root system is developed, strong absorption of fertilizer, it is advisable to choose a deep soil layer, loose soil, good soil quality, irrigation and drainage capacity, pH value between 4.2-8.3 plots.