Planting time of sunflower

Sunflowers have a short growth cycle and are not afraid of high temperatures. In order to bloom well, we usually choose to sow seeds from March to April, which is the prime time for sunflower planting. The best temperature for sunflower sowing is between 18 and 25 degrees, and it can blossom about 50 to 80 days after planting.

Obviously can rely on appearance, but must rely on the strength of sunflowers, we must like it very much. In fact, the planting method of sunflowers is very simple, and beginners can easily grow them at home.

When do sunflowers sow? Introduction to sowing time of Sunflower

Sunflowers can be planted in all seasons, usually in summer and winter, with a flowering period of more than two weeks. in addition to being similar to the sun in appearance, bright and generous flowers are very suitable for ornamental decorations, and the seeds are of more economic value. it can not only be made into beloved sunflower seeds, but also extract high-grade edible sunflower oil with low cholesterol. Let's take a look at when sunflowers will be sown.

Sowing time of sunflower

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 growing environment of sunflower

1. Temperature: sunflower is a temperature-loving and cold-tolerant crop, which has strong adaptability to temperature and strong tolerance to low temperature. Seeds with stable local temperature begin to germinate when the local temperature is more than 2 ℃, and can germinate and take root at 4-5 ℃. When the ground temperature reaches 8-10 ℃, it can meet the needs of seed germination and emergence. During the whole growth process, sunflowers can grow normally as long as the temperature is not lower than 10 ℃.

2. Water: sunflower is a crop that consumes a lot of water, with tall plants, many leaves and dense leaves, and its water absorption is 1.74 times that of corn, but because its growth and development is synchronized with local rain and heat, the contradiction between water supply and demand is not prominent. there are great differences in water requirements at different growth stages. There is not much water from sowing to budding, the peak of water demand from budding to flowering, and more water from flowering to maturity.

3. Light: sunflower is a short-day crop, which is not very sensitive to sunlight. Like plenty of sunlight, its seedlings, leaves and disk have a strong phototropism. Sufficient sunshine and strong seedlings can prevent overgrowth. Sufficient sunshine in the middle growth stage can promote the vigorous growth of stems and leaves, normal flowering and pollination, and improve the seed setting rate. In the later stage of growth, the sunshine is sufficient, and the grain is full.

4. Soil: sunflowers have low requirements for soil and can grow on all kinds of soils, from fertile soil to dry land, barren and saline-alkali land. It not only has strong saline-alkali tolerance, but also has salt absorption ability. At the same time, sunflower has developed root system and strong drought resistance. Moreover, the root and stem aerosol tissue of sunflower is well developed, which is very resistant to waterlogging.

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.

When will the sunflowers be planted? Planting time and method of sunflower

Speaking of sunflowers, I believe everyone will be familiar with it. Sunflower is an annual herb of the genus Compositae, which not only has high ornamental value, but also an important oil crop in China. It also attracts many farmers to plant it. So, when will the sunflowers be planted? How to plant it? The following is to introduce the planting time and methods of sunflowers, let's take a look.

Picture: sunflower

1. Planting time of sunflowers

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 is covered with about 1 cm, and the flowers are about 50-80 days after sowing.

Picture: sunflower

Second, the planting method of sunflower

1. Land selection and soil preparation: sunflower cultivation should choose plots with flat land, medium fertility, convenient irrigation and drainage, relatively low soil viscosity, and should not be replanted. Reproduce in the way of seeds, and peat soil is suitable for sowing. Seed dressing with new high-fat membrane before sowing can ward off underground pests, isolate virus infection and improve seed germination rate.

two。 Sowing at the right time: the sowing time of sunflower is generally from March to April, the suitable temperature for sowing is 18-25 ℃, and it usually 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.

3. Field inspection and seedling replenishment: sunflower is a dicotyledonous crop, and it is difficult to emerge from the top soil, coupled with low soil preparation and sowing quality, or hardening of topsoil after sowing, or damage caused by diseases, insects, rats, finches, etc., are easy to cause lack of seedlings and broken ridges. In order to ensure the whole seedling sowing, the field-by-line inspection must be carried out at the seedling emergence stage, and the missing seedlings should be replanted in time.

4. Seedling determination: sunflower cultivation should be early to prevent seedling squeeze, affecting the cultivation of strong seedlings, and even the future yield, as for saline-alkali land and pest-heavy plots, the seedling fixing time can be postponed appropriately. At the same time, sunflower seedlings should be determined as early as possible, which is conducive to the cultivation of strong seedlings and disk development, which should be carried out at 2 pairs of true leaves.

Picture: sunflower

5. Middle ploughing and weeding: sunflower general intertillage 2-3 times plays the role of weeding and loosening soil, breaking indentation, conserving water, reducing evaporation, reducing saline-alkali damage and so on. the first intertillage was carried out in combination with seedlings in 1-2 pairs of true leaves, the second intertillage was carried out one week after seedling setting, and the third intertillage was completed by ditching, soil cultivation and fertilization before ridge closure.

6. Ditch topdressing: sunflowers prefer fertilizer, ditch topdressing is usually carried out in the third intertillage, mainly nitrogen and phosphorus fertilizer, diammonium phosphate 5 kg per mu, urea 10 kg, mixed evenly and then applied to the soil. Trenching and soil cultivation can effectively ensure the growth and development of secondary roots, prevent lodging and reduce the basal branches below cotyledon nodes.

7. Timely irrigation: sunflower irrigation using furrow irrigation, the general plant height of 1.5 meters of varieties, head water should be carried out in the flower bud stage, two water in the early flowering stage, Sanshui in the filling stage. For the varieties with a plant height of about 2 meters, the head water was carried out 4-5 days before flowering (severe drought and irrigation in advance), the second water was 6-7 days after the head water, and the three water was in the filling stage.

8. Pollination management: the seed setting rate of self-pollination of sunflower is low, and the seed setting rate of cross-pollination is high. Artificial pollination should be carried out in time during cultivation, pollination should be carried out by means of disk, pollination, cotton thread gloves, etc., or collect the pollen of the male parent and gently apply it to the stigma of the female parent with a small brush, pollination should be carried out 3-4 times in full bloom.

[editor's conclusion] Sunflowers are cultivated all over China and have high cultivation value. The above introduces the planting time and methods of sunflowers. I hope it can be helpful to you!