What is the suitable temperature for heading and flowering of rice?

The average daily temperature at heading and flowering stage of rice is generally 24 ~ 29℃. When the average temperature of the day is lower than 23℃ or higher than 30℃, flowering and pollination are poor. The lower or higher the temperature, the greater the influence.

Rice is an annual gramineous plant. I like high temperature, humidity and short sunshine. Rice is not strict with soil, and paddy soil is the best soil. The lowest temperature of seedling germination is 10 ~ 12℃, and the optimum temperature is 28 ~ 32℃. The average daily temperature at tillering stage is above 20℃, and the optimum temperature for ear differentiation is around 30℃. Low temperature will prolong the differentiation of branches and glumes. The optimum heading temperature is 25 ~ 35℃. The optimum average temperature for flowering is about 30℃, and lower than 20℃ or higher than 40℃ will seriously affect flowering and pollination.

Extended data:

Definition of heading date of rice The statistics of heading date of rice is from the beginning of heading date to the end of heading date.

The heading stage index was 10%, which was achieved in the whole population. The index of full heading stage is 80%. So what is the heading degree per ear? It is generally believed that exposing more than 3 grains after ear breaking is the index of heading per ear.