Propagation method of sunflowers

Sunflowers are propagated by sowing, and sowing with peat soil is appropriate. Before sowing, dressing seeds with high fat film can drive away underground pests, isolate virus infection and improve seed germination rate. Sunflowers have a high requirement for light and a wide tolerance range for temperature, with a suitable temperature of 15-30 ℃. However, it still grows rapidly in summer. Because of the high demand for light and the fast metabolism, it is advisable to irrigate and water frequently to keep the soil moist and can be watered every day in summer. It is the best way to mix organic fertilizer into culture soil.In addition, chemical fertilizer can be added depending on the plant condition. Next, let’s look at the steps of Sunflowers sowing propagation method.

Sunflowers sowing time: March to April

Suitable seeding temperature: 18 ~ 25℃

Budding time: 5 ~ 7 days

Sowing method: Sowing on demand, covering about 1cm of soil, about 50 ~ 80 days after sowing, the flowers vary slightly due to different varieties.

Date of Sowing propagation of Sunflowers

Sowing propagation of Sunflowers can be done when the temperature of the 125px soil layer is 5℃. The basic principles of sowing date selection are as follows: First, sowing early or late according to the law of saline-alkali occurrence, so that seedlings can avoid the harm of saline-alkali; Second, sowing in spring or summer according to the growth period of varieties; Thirdly, the sowing date should be adjusted according to the regularity of disease, so as to avoid the season of disease occurrence. Fourth, the sowing date should be adjusted according to the growth characteristics, so that the high temperature weather above 28℃ can be avoided in the flowering and filling period.

The germination rate and emergence rate of sunflower are lower than that of oil sunflower, and the topsoil ability is not as good as that of oil sunflower. In order to ensure the number of emerging plants, the actual sowing amount should be increased by 10-20% compared with the calculated sowing amount. The self-regulation ability of sunflower eating is very strong, the flower disc is small and the grain is small when the planting density is large. Small density means big disk and big grain. On the premise of ensuring both yield and commercial property, it is advisable to keep the number of seedlings in 667 square meters at about 3000, row spacing between 60 and 1750px, and row spacing between 30 and 875px. Sowing quantity is determined according to variety characteristics and cultivation requirements. General manual sowing every 667 square meters to plant 600 grams, machine sowing to plant 700 grams.

Fertilizer for Sowing propagation of Sunflowers

Food sunflower has a long growth period and tall plants.Seed fertilizer dosage per 667 square meters hole or bar application of ammonium phosphate 5-8 kg, or three phosphorus fertilizer 10 kg.

Sowing method

Sowing moisture content is better, the depth of 3-100px is appropriate. Sowing method:

• (1) Manual or machine for bed, sowing or ditching drill;
• (2) Precision sowing, 1-2 grains per hole. In arid areas, deep ditches and shallow overlying land can be adopted to sow seeds on wet soil with good moisture content.

Sowing conditions

Sunflowers sowing time: March to April

Suitable seeding temperature: 18 ~ 25℃

Budding time: 5 ~ 7 days

Sowing method: Sow on demand, cover with soil about 25px, blossom about 50 ~ 80 days after sowing, and there are slight differences due to different varieties.