How Many Days Does It Take for Oil Sunflower to Emerge? A Detailed Explanation of Emergence Time

Oil sunflower is China's fifth largest oil crop. The oil extracted from it can be pressed into a low-cholesterol, premium edible sunflower oil. At present, many growers plant oil sunflower. So how many days does oil sunflower take to emerge?

1. How many days does oil sunflower take to emerge?

After planting, oil sunflower can emerge within one week. After emergence, check the seedlings and fill in gaps promptly. In areas with missing seedlings, when 1 pair of true leaves has formed, promptly transplant with soil attached or replant after pre-sprouting the seeds.

2. Cultivation Techniques

1. Sowing: When sowing oil sunflower, first master the temperature well and pay attention to weather changes. Under normal circumstances, once the soil temperature can remain above 5°C, oil sunflower can be sown. If the temperature is too low, it will affect the emergence rate, and the seedlings are prone to frost damage. At the same time, pay attention to sowing depth, generally maintaining 3-4 cm as suitable. In addition, carry out rational close planting to increase oil sunflower yield.

2. Management: To ensure the emergence rate of oil sunflower, seeds should be soaked before sowing. After emergence, fill in gaps promptly. The best method is to transplant seedlings to fill gaps, and the filling time is best in the evening or on cloudy days. When the seedlings grow to two pairs of true leaves, thinning and final singling should begin. The principle of final singling is to keep large and strong seedlings. For plots with poor soil and heavy pest damage, appropriately delay the final singling period according to the situation.

3. Fertilization: Cultivation loosens the soil, prevents compaction, reduces water evaporation, and can also eliminate weeds and reduce unnecessary nutrient consumption. Especially after rainy days, cultivation must be carried out promptly. Although oil sunflower does not have high soil requirements, fertile land is more conducive to oil sunflower growth. Therefore, throughout the entire growth process of oil sunflower, timely topdressing should be carried out to enhance its ability to resist natural disasters. For plots with poor soil and insufficient base fertilizer, increase the amount of topdressing at the bud stage. Topdressing is generally applied in holes, and the trench application method can also be used. Urea, compound fertilizer, etc. are suitable for topdressing.

4. Pollination: Oil sunflower is cross-pollinated, and insects are the main pollinators. Therefore, when pollinators are insufficient, artificial supplementary pollination should be carried out for oil sunflower. There are mainly two methods of supplementary pollination: one is to use tools to collect pollen from the flower buds, then use a row brush or soft brush to lightly wipe these pollens one by one against the flower disc. The other method is the flower disc contact method. During full bloom, face two adjacent flower discs toward each other and gently rub them to achieve mutual pollination. Because oil sunflower planting areas are generally large, artificial supplementary pollination inevitably consumes a large amount of labor and is relatively difficult. The best method is still to use insects as pollinators, which is the most scientific and ideal. For example, raising bees near oil sunflower planting areas not only benefits oil sunflower growth but also provides honey income, achieving two goals at once.

3. Uses

Sunflower oil is widely recognized as a health oil, with a linoleic acid content of about 66%. Linoleic acid is an essential fatty acid for the human body. It helps eliminate cholesterol and its products, can alleviate arteriosclerosis, and maintain blood pressure balance. It is especially beneficial for heart disease and high blood pressure. Because its oil has a low melting point and can dissolve at 17°C-27°C, it is extremely easy for the human body to absorb, with an absorption and utilization rate of 93.5%. Second, hybrid sunflower oil can also be used in industrial production. Hybrid oil sunflower is a semi-drying oil with excellent quality and is easy to refine and process. Its linolenic acid content is only 0.2%, and it has good drying oil characteristics. Used as a raw material for paint, it will not deteriorate over time; used for leather making, it makes leather tough and shiny. At the same time, it is also an important raw material for cosmetics, printing oil, margarine, pastries, plastics, resins, film, polyester, lubricating oil, spices, soap, lecithin, and candles. The processed oil cake is rich in nutrients and is a fine feed for livestock and poultry, and is best for feeding dairy cows. Therefore, the market potential of oil sunflower is extremely broad.

Oil sunflower has very wide applications, and its planting prospects are also very good. If conditions permit, it can be planted appropriately.