Sunflower seeds are generally considered to be its fruit.Academically known as achenes, commonly known as red melon seeds, sunflower seeds.But the fruit includes the pericarp, the seed coat, the embryo three parts, the sunflower seed specifically refers to its embryo namely the melon seed kernel.Seeds can be eaten and pressed oil, which is rich in unsaturated fatty acids, proteins, sugars and other vitamins and trace elements, is a very popular snack and edible oil source.Generally, the edible seeds are longer, the pericarp is thick, and the color is mainly black and white stripes.The seeds of oil type are short and thin, and the color is mainly black.
The sowing time of sunflower is from March to April, and the suitable temperature for sowing is 18-25 .Before sowing, the seeds should be soaked in warm water first, and then sowed after germination.The sowing time should be decided according to the variety of seeds, generally mainly in spring and autumn.It is most suitable for planting in flat, medium fertility, convenient irrigation and drainage, and relatively small soil viscosity.
Sunflowers usually germinate around 5-7.When sowing sunflower, we should ensure that the ground temperature is within a certain range, which helps the seeds germinate smoothly and quickly.When the local temperature is above 2 deg C, the seeds germinate; When the temperature is between 4 and 5 deg C, the seeds can sprout and take root; When the ground temperature reaches 8 to 10 deg C, the seeds can germinate and emerge.The optimum temperature for seed germination is 31-37 , and the highest temperature can reach about 38-44 .
