This is because only in this way can it meet the needs of its growth. The stem on the back of sunflower disk contains auxin, which is a hormone. Plants generally contain hormones, which can make plant cells divide more and grow faster, thus making more and more cells in plants.
After flowering, because the pollen of sunflower is particularly afraid of high temperature, we know that the sunshine at noon is the strongest and the temperature is the highest in a day, so its disk faces east, which can avoid the direct sunlight at noon.
Extended data:
Sunflower planting:
Sunflowers can't be continuously planted, and they are not suitable for planting in low-lying and waterlogged plots, so the selection of previous crops is not strict, except sugar beet and deep-rooted grass.
Other crops can be the previous crop of sunflower, which has strong adaptability and is very suitable for places with deep soil layer and high humus content. If the ph value is around 6-8, it is best to plant it in sandy soil.
If you choose varieties, it is best to choose high-quality varieties with high yield, good quality, good commodity, strong disease resistance and high germination rate. Seed treatment can give full play to their role.
Sunflowers need more fertilizer. Generally 100 kg seeds need to absorb 6 kg of nitrogen, 26 kg of phosphorus and 86 kg of potassium from the soil. Sufficient fertilizer should be applied before sowing to achieve organic-inorganic combination.
It also needs 30-40 cubic meters of organic fertilizer per hectare, and applying base fertilizer is the growth foundation for high and stable yield.
Reference source: Baidu Encyclopedia-Sunflower