How to grow sunflowers?

Get a piece of land, clean the grass, fertilize it, turn the soil with a shovel, water it, and bury the seeds (about 40cm). Water regularly after budding, but don't overdo it. ....

Sowing: Put 2-3 seeds in No.3 flowerpot or sow in a flat-bottomed flowerpot (seeds are soaked in water for one night) with a depth of 2-3cm. When sowing seeds directly in the flower bed, bury humus soil or fertilizer first, and then spread it on it. The spacing is 20-30cm, and the plants are densely planted, so don't worry about growing too big. When planting in groups, if the seeds are planted in rows, the flowers will not overlap and look beautiful. When the leaves grow to two pieces, they should be transplanted or replanted as soon as possible. Transplants wither when they grow up.

Fertilization: Sunflowers are strong, easy to grow and easy to absorb fertilizer and water around them. Herbaceous flowers planted near sunflowers, especially exotic flowers, will grow poorly. When planting, we should add enough compost, dried cow dung, hemp residue, bone meal and other base fertilizers. Don't forget to add topdressing and liquid fertilizer.

sunflower

Also known as sunflower, because it always grows towards the sun, people also call it sunrise flower. Sunflowers are panicum miliaceum, with straight and thick stems and coarse white hairs. The leaves are heart-shaped with notches or serrations on the edges. The flower head of sunflower forms a big disc and is born at the top of the stem. The center of the disk is a tubular flower, which can form fruit after pollination, and is often called sunflower seed. The edge of the dish is a tongue-shaped flower, which is mainly used to attract insects. The ligulate flower is protected by a green involucre. The hometown of sunflower is America. Now it is cultivated all over the world. Sunflower seeds contain a lot of fat, so sunflowers are oil plants.

Growth characteristics of sunflower

☆ Requirements of Sunflower on Environmental Conditions

1. Sunflowers are hardy, seeds can germinate at 5 ~ 10℃, and seedlings can tolerate the low temperature of -2℃. Therefore, in the alpine region, varieties with longer growth period can be sown early.

2. Water sunflower has strong drought tolerance, and its water absorption before flowering is less, accounting for only 20% ~ 25% of the whole growth period. Ensuring water supply from flowering to filling is the key to high yield and harvest.

3. The nutrient tray absorbs the most nutrients from formation to flowering, accounting for 3/4 of all nutrients. There is little nutrition absorbed at seedling stage, the most phosphorus is needed from seedling emergence to disc formation, and the most potassium is absorbed from disc formation to wax maturity. In order to ensure high quality, high yield and full seeds of sunflower, we should pay attention to the application of total fertilizer, mainly phosphorus in the early stage and nitrogen and potassium in the middle and late stage.

4. Soil sunflower has strong adaptability, and the choice of soil quality is not strict, so it can be planted in general land.

5. Sunflower pollination mainly depends on insects and partly on wind. The normal fertilization process depends on suitable temperature, sunlight, atmospheric humidity, insect activity and wind power. High temperature and dry weather can easily weaken the viability of pollen and affect normal fertilization. Continuous rainfall at flowering stage affects insect activities such as honey peak. Through natural pollination, the empty shell rate of sunflower is generally above 40%. Therefore, in order to improve the seed setting rate of sunflower, the method of putting 5 mu of land 1 box of bees can be adopted.

Sunflower is a cross-pollinated crop, pollinated by insects and bees. However, artificial pollination is needed. Pollination time is about 10 every morning (from 9: 00 am to 1 1 am), and pollination can be carried out for 2-3 times.

It takes a long time to plant sunflowers in March and April in spring.

Clam`

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