Sunflower is a genus of sunflower in the family Asteraceae, alias: sunrise flower, sunflower, sunflower, sunflower, sunflower. Most people have eaten sunflower seeds , which are grown by the sunflower, how much do you know about the key points of growing sunflowers? The next the sunflower seed supplier will introduce the key points of growing sunflowers.
Sunflowers are native to South America, domesticated by the Spanish in 1510 from North America to Europe, initially for ornamental use. 19 century, and was introduced back to North America from Russia. They are cultivated in China. Sunflower seeds are called sunflower seeds and are often fried and eaten as a snack, which is delicious.
In many places sunflower is grown on saline, sandy and dry soils, mainly because it is very resistant and more cost effective than other crops. Although sunflower does not have strict soil requirements, it can grow on all types of soil, from fertile soil to dry, infertile and saline land. However, the potential to increase yields is greater when planted in fields with a deep layer, high humus content, good structure and good water and fertiliser retention. Better yields and higher economic benefits can be obtained.
In the case of oil sunflower seeds, dormancy is usually 20 to 50 days after harvest. Dormancy is biologically important as it allows the seeds to remain 'asleep' until the normal sowing season. Germination can be avoided on the disc during the seed maturity harvest season, even in the event of continuous rainy weather. This dormancy will pass naturally after the current year's harvest and the next sowing season. In exceptional cases where freshly harvested seeds are used for sowing or research work, dormancy can be broken manually. Generally, seeds are soaked in a solution of 50 to 100 micrograms/ml of ethylene glycol for 2 to 4 hours and then germinated under suitable conditions. Gibberellin is also useful for breaking dormancy in oilseed sunflower seeds.
Sunflower is a temperature-loving crop and a cold-tolerant crop with good adaptability to climatic conditions. When the ground temperature in the soil layer (0-20 cm) reaches 2°C, the seeds start to sprout, 4-6°C can germinate and 8-10°C can be used for seedling growth. In addition, seedling emergence is closely related to seed quality, moisture, oxygen and the composition and structure of the soil.
General oil sunflower from seedling to maturity need ≥ 5 ℃ effective cumulative temperature of about 1700 ℃; edible sunflower from seedling to maturity need ≥ 5 ℃ effective cumulative temperature of about 1900 ℃.