What are sunflowers seeded with?

Sunflower planting technology

Sunflower planting technology

1, site selection: sunflower planting should choose flat land, medium fertility, convenient irrigation and drainage, low soil viscosity land, should not be repeated. Seedlings are offspring, and peat soil is suitable for sowing. Seed dressing with new high-fat film before sowing can drive out underground pests, isolate virus infection and improve seed germination rate.

2, sowing in time: the sowing time of sunflower is generally 3-4 months, the suitable temperature for sowing is 18-25 ℃, and 5-7 days after sowing. The basic principle of selecting sowing date is to sow early or late according to the regularity of saline-alkali, so that the seedlings can avoid saline-alkali. Sow seeds in spring or summer according to the growing period of the variety.

3, tea field re-emergence: sunflower is a dicotyledonous crop, the top soil is difficult to produce, coupled with soil preparation, low sowing quality or Rain Water on the soil surface after sowing, or diseases, insects, rats, birds and so on. A ridge with broken seedlings. In order to ensure the sowing of the whole seedling, the seedlings must be checked line by line at the seedling stage and updated in time.

4, seedlings: sunflower cultivation should be early to prevent seedlings from squeezing seedlings, affecting the cultivation of seedlings, and even the future yield. For saline-alkali land and heavy insect plots, the seedling stage can be postponed appropriately. At the same time, sunflowers should be fixed as soon as possible, which is beneficial to the cultivation of seedlings and the development of disk. Seedlings should be carried out with two pairs of real leaves.

5, cultivation and weeding: sunflower is generally cultivated for 2 or 3 times, weeding and loosening soil, knotting, saving water, reducing evaporation, reducing saline-alkali damage, etc., first, cultivate 1-2 pairs of true leaf combined seedlings and cultivate them well one week after fixed seedlings, the third cultivation is combined with ditching, soil cultivation and fertilization, and then seal the spine.

6. Trenching and topdressing: sunflowers are more like fertilizing. Trenching and topdressing are usually carried out in the third cultivation. Mainly use nitrogen and phosphate fertilizer. 5 kg of diammonium phosphate per acre and 10 kg of urea were mixed and applied to the soil. Through trenching soil, we can effectively ensure the growth of secondary roots, prevent lodging and reduce the branches at the base below the cotyledon nodes.

7, timely irrigation: sunflower irrigation using furrow irrigation, the general plant height of 1.5 meters, head water should be carried out in the flower bud stage, good secondary water in the early flowering stage, three water in the filling stage. For plants with a plant height of about 2 meters, the head water is carried out 4 to 5 days before flowering (severe drought, irrigation is advanced), good water is carried out 6 to 7 days after the head water, and the water is in the filling stage.

8. Pollination management: the self-pollination rate of sunflower is low and the cross-pollination rate is high. When planting, you must carry out artificial supplementary pollination in time, and pollinate with pollen, pollination, cotton gloves, or collect the father's pollen. Apply a small brush gently to the stigma of the female parent and pollinate 3 to 4 times during flowering.

What does sunflower mean?

Sunflower is an annual herb of Asteraceae. Sepals multilayered, leafy, imbricate, pubescent, summer flowering, neutral yellow ligulate flowers at inflorescence margin, unstable. The middle part of the inflorescence is bisexual tubular flowers, brown or purple, hard. Domesticated species native to South America was brought to Europe by the Spaniards in 1510 and was originally used as an ornamental. At the end of the 19th century, it was brought back to North America from Russia. It is grown in China. Sunflower seeds are called sunflower seeds. They often fry and eat after eating. They are delicious and can be used to cook sunflower oil. Oil residue can be used as feed.

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Sunflowers, also known as morning sunflowers, are named for their flowers that often face the sun.

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The flower language of sunflower is faith, glory, pride, loyalty, love, sunflower means silent love, sunflower represents the courage to pursue the happiness you want. Although the flower posture of the sunflower is not as romantic as the rose, but it is not as pure as the lily, but it is sunny, bright, frank love, love is inseparable, has its own unique charm, it will not bloom only love, but also be passionate about life and life. Sunflowers represent chasing the sun.

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Why do sunflowers face the sun?

Why do sunflowers face the sun?

The stem of a sunflower contains a wonderful auxin, which is afraid of light. When it is exposed to light, it enters the back of the backlight. At the same time, it can stimulate the cells on the backlight side to multiply rapidly, so the side of the backlight grows more than the side of the light. Speed bends the sunflower toward the light. From germination to disk flowering, sunflowers are indeed in the sun. Once the disk is in full bloom, it will not turn to the sun, but will be fixed toward the east.

What if the sunflower has yellow leaves?

1. Water yellow: the branches are yellowish green and grow slowly, but the old leaves have no obvious change, indicating that they are overwatered. Watering should be controlled, plants should be removed from pots, placed in a cool place to dry and replanted.

2, dry yellow: lack of water and yellow, leaf tip and bottom is first dry, dry, plants turn yellow from bottom to top, but new leaves grow normally. Do not pour too much water at once to make sure it is thoroughly poured in and the soil is moist.

3, lack of light yellow: put in a cool environment for a long time, the leaves can not see the light, the leaves of the whole plant will be yellowed. Put the plant in the sun, and if there is no light, fill the light with a fluorescent lamp.

4, excessive fat yellow: excessive fertilization or too high concentration will lead to yellowing of leaves. The leaves are dull, causing the old leaves to fall off. At this point, fertilization should be stopped and water should be washed to flush soil fertility. Or sprinkle some radish and cabbage seeds around the plants to let them absorb nutrients from the soil.

5, lack of fat yellow: small potted seedlings with dense roots and dark yellow leaves. The old leaves should be cut off and the old leaves of the plants should be cut off. If the soil has a dry knot, it should be replaced in time. Usually pay attention to thin fat, you can pour some water.

Time: 2019-05-13 Click: