When will the latest sunflowers mature?

Sunflower, also known as sunflower, zhuanlian, sunflower, etc., is a sunflower plant of the Compositae family, originating in South America, and is cultivated all over our country. The seeds are called sunflower seeds, which are often used as snacks after stir-frying. Sunflower seed oil can also be used as food, and oil dregs can be used as fodder. Let's take a look at when the sunflower will mature.

When does the sunflower mature?

The mature time of sunflowers is closely related to the sowing time. Sunflowers planted in spring generally mature from July to September. When they bloom, the yellow flowers in the sunflower fields bloom facing the sun. After the seeds are harvested from July to September, they can be preserved for a long time. At the same time, the maturity time of different sunflower varieties is slightly different.

When do sunflowers sow?

The sowing time of sunflower is from March to April, the suitable temperature for sowing is 18: 25 ℃, and the sunflower sprouts about 5-7 days after sowing. The basic principle of sowing date selection is to sow early or late appropriately according to the occurrence law of saline-alkali, so that the seedlings can avoid the harm of saline-alkali. Spring sowing or summer sowing according to the growth period of the variety. Adjust the sowing date according to the disease law to avoid the disease-prone season. The sowing date was adjusted according to the growth characteristics to avoid the high temperature of more than 28 ℃ during flowering and filling period. The sowing method is on demand, the soil cover is about 1 cm, and the flowers are about 50-80 days after sowing, which varies slightly according to different varieties.

The growth cycle of sunflower

1. Seedling stage: sunflower is called seedling stage from emergence to budding, which generally takes 35-50 days and 28-35 days for summer sowing. This period is the stage of leaf, flower primordium formation and floret differentiation. Sunflower seedling stage is the strongest stage of drought resistance, the aboveground growth is slow, the underground root grows faster, and quickly forms a strong root system.

2. Budding period: it takes about 20 days for sunflower to blossom from budding to flowering. It is the most exuberant stage in life for both vegetative and reproductive growth. During this period, the largest amount of fertilizer and water is needed, accounting for about 4050% of the total amount of fertilizer and water. If the demand for water and fertilizer can not be met in time, the output will be seriously affected.

3. Flowering period: it usually takes 6-9 days for a sunflower disk to bloom from ligulate flower to tubular flower, and blossoms from the second day to the fifth day. Most of them bloom at 4: 6 a.m. and the unpollinated branches can be kept for 7-10 days the next morning. However, the seed setting rate of self-pollination is only about 3%, and the seed setting rate of cross-pollination is high.

4. Maturity: sunflower maturity refers to the stage from flowering to maturity, with 25-55 days of spring sowing and 25-40 days of summer sowing, with differences among different varieties. About 15 days after flowering and pollination shield is the stage of grain formation. Sunflower maturity needs sunny weather, large diurnal liquid temperature difference and suitable soil moisture.