How to grow onions: when will onions be planted? What kind of soil does onion suit?
What are the requirements of climate and soil conditions for onion cultivation, and how to grow good onions.
Onions prefer sunny, warm and cool climates and avoid high-temperature and humid environments. The optimum temperature for seed germination, root group development and stem and leaf development were 16 ℃ to 25 ℃, 15 ℃ to 20 ℃ and 20 ℃ to 26 ℃ respectively. In all stages of onion growth and development, if the temperature exceeds the suitable temperature range, the higher the temperature is, the slower the growth is. In case of high temperature during the heading period, the plant will mature earlier, and the onion ball can not be fully enlarged, which will affect the quality and yield. Under normal conditions, onions should be planted between the first and middle of September.
The heading property and sunshine length of onion are related to the temperature, so it is suitable for planting period from autumn and winter to spring of the next year, during which the temperature is cool and comfortable, and the sunshine time is short, which is suitable for the growth and development of short-day onion varieties. long-day onion varieties are generally not suitable for local climatic conditions. In terms of rainfall, onion plants need a wetter environment during the growing period, but not too much in the late heading period, especially in the onion harvest period, they are most afraid of rain, and the onion balls before harvest are easy to rot when it rains and are not resistant to storage, and the quality will also be reduced.
Onion has only whisker root, and the bad development of root group is significantly related to heading and resistance to disease and insect pests. The cultivated soil is the best in sandy loam, which is rich in organic matter, and does not like acidic soil. The soil pH value from 6.0 to 6.5 is the most suitable for onion growth. When the soil pH value is below 6.0, it needs to be corrected by lime. When the soil pH value is below 4.5, it is almost impossible to grow. In addition, onion is not suitable for continuous cropping and is not suitable for post-cropping of cabbage, cabbage, potato, sweet potato and other crops, but it is suitable for rotation with rice, corn and other Gramineae or legume crops.
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