What is the suitable temperature for rice flowering?

The suitable temperature for rice flowering is 25-30℃.

Generally speaking, the optimum temperature for rice flowering is 25-30℃. When the daily average temperature is lower than 20℃ or higher than 35℃, rice will be affected and empty grains will increase. Temperature is the most important factor affecting flowering. The optimum temperature for flowering is about 30℃, and the lowest temperature is 20℃. The morning and evening of flowering peak is related to temperature.

When the weather is clear and the temperature is high, the flowering time is relatively early; Otherwise it will be postponed. Flower closing is a protective response of rice to low temperature. When the low temperature lasts for more than 3 days, although the flowers can still be closed, the seed setting rate will also decrease obviously after the temperature rises.

Rice is sensitive to high temperature from flowering to filling, and sensitive to high temperature (≥37℃) when flowering. High temperature will affect pollen survival time and style vitality, leading to poor fertilization.

Matters needing attention in rice planting after flowering:

1, scientific water management

Rice is sensitive to water from flowering to milk ripening, which is the second critical period of water in physiology. The principle of water control is "start with water, fill it wet, and stop water at the right time".

Step 2 carry water forward

During the heading and flowering period of rice, the rice field is dry, the pollen and stigma are easy to dry up, pollination is impossible, and heading is even difficult. Therefore, there should be a water layer during heading and flowering to avoid dehydration and drought.

3. Wet grouting

After flowering and fertilization, rice grains are full and need water, so they can't be flooded for a long time.

4. Stop water supply in time

After rice is yellow-ripened, the physiological water demand decreases, so it is necessary to cut off the water at the right time, but not too early. The water cut-off time depends on the paddy field. Generally, the water stop time can be about one week before harvest in paddy field, about half a month in deep mud field and 3-5 days in sand field.