When Shikui 363 is in full bloom, if the soil is dry, water it in time to keep the soil moist. But don't drown it with water. Especially under the condition of high temperature and strong light, water should be supplemented to avoid leaf wilting and affecting growth. It is more important to avoid plants being too dry and to replenish enough water. Sunflower flowering, in case of high temperature and drought, you can choose to water it in the morning and evening.

Sunflower likes temperature and drought tolerance, and its growing period is more than 85 ~ 120 days. The suitable growth temperature is 15 ~ 30℃. Therefore, the suitable sowing date can be adjusted according to its growth characteristics, so that the high temperature weather above 28℃ can be avoided as far as possible during flowering and filling.

When a star-shaped body with a diameter of 1 cm appears at the top of sunflower, it is commonly called budding. It usually takes about 20 days from germination to flowering. During this period, sunflower needs fertilizer and water most, accounting for about 40% ~ 50% of the total fertilizer and water demand. If the demand for water and fertilizer cannot be met in time during this period, the output will be seriously affected. ?

The self-pollination rate of sunflower is generally low, only about 3%; Cross pollination has a high seed setting rate. However, if the temperature is high, the rain is heavy, the humidity is high, the light is insufficient, and the soil is dry, the seed setting rate will be greatly reduced, so it is necessary to cooperate with artificial pollination to improve the seed setting rate of sunflower.