Its cultivation history can be traced back to India in 3000 BC. China is also a country with a long history of rice cultivation. Rice was planted in the Yangtze River Basin of China in 7000 years. Later, with the spread, it gradually developed to the West and was introduced to the south of Europe in the middle ages. Another theory is that it originated in Nigeria in western Africa, about 3500 years ago. Now the distribution range is very wide, generally in the tropical, temperate, semi - tropical coastal plain, in China, generally concentrated in the Southern Yangtze River Basin and other areas.
1. Soil: it is not very strict for the substrate requirements, as long as the drainage soft soil can be planted, but the best is paddy soil.
2. Temperature: there are certain requirements for temperature. The minimum temperature of seedling germination should be 10-12 ℃, and the most appropriate temperature is 28-32 ℃. If the temperature is too low, the differentiation time will be prolonged. If the temperature is lower than 20 ℃ or higher than 40 ℃, pollination will be seriously affected.
3. Humidity: it needs the support of humidity in the growing environment. Only when the humidity is high, can the spike be pulled out. The relative humidity is 50-90%, which is the most suitable.
