Dwarf sunflower cultivation techniques

The dwarf sunflower is a one-year herbal flower of the Asteraceae sunflower. The plants are short, with dense foliage, large flowers, various species, rich colors, dark red, brown, copper, golden, lemon yellow, milky white and other colors, have a high ornamental value, can be potted or planted, is a flower arrangement , flower borders and festive decorations. 1. Variety selection Choose the big smiling species in the dwarf sunflower. The plant height is 30 to 40 cm, the flower diameter is 10 to 17 cm, single petal is bright and golden, and the flower center is black. Generally 50 to 55 days after flowering, it can bloom. Planted in potted plants and flower beds. 2. Seedlings are sown and propagated, usually sown in April. The optimum temperature for germination is 15 to 18°C. It can be used in shallow or shallow tanks. The medium requires looseness, good water retention, and sterility. Seeding is suitable for on-demand broadcasting. Two seeds per hole are sown. After sowing, it needs to cover 1 to 2 cm thick medium to maintain the required humidity for germination, and increase the stability of seedling stage and reduce the occurrence of shelled seedlings. Generally germinate 7 to 14 days after sowing, pay attention to ventilation after cooling, control humidity, and gradually see light. 3. Colonization and conservation When the seedlings emerge one after another, one seedling is left in each hole and the seedlings can be planted at a height of 7 to 8 centimeters. Pottery soil is rich in humus and well-drained sandy soil. When planting pelvic floor base fertilizer, as much as possible when carrying out seedlings with soil, less root damage, so that the plant faster recovery. Dwarf sunflowers enjoy a sunny and warm environment, not tolerant to yin and cold. The fertilization is applied once every 20 days during the growth period, but 2 to 3 thin phosphorus and potassium fertilizers should be applied before flowering. Wet soils are often maintained, especially during summer when high temperatures and droughts require timely watering. In order to make the top buds of the main branch robust and grow, the side buds can be removed. For the slightly higher stalk should be set up to prevent the wind from lodging. Artificial pollination during flowering can increase the seed setting rate. 4. Diseases and Insect Pests Prevention Common pests include powdery mildew and black spot. At the onset of powdery mildew, the leaves started to have white, round and powdery spots, and they expanded into one piece. Afterwards, the white powder layer had brown spots and the plant growth stopped. At the onset of melasma, the leaves developed dark brown or light yellow lesions of varying sizes and later developed into brown patches. The lesions were connected to large plaques and the leaves turned black and died. During the onset, the stubble can be removed and sprayed with 75% chlorothalonil wettable powder 500 times or 70% thiophanate-methyl wettable powder 800 times for control. Insect pests are mainly blind and red spider mites. They can be sprayed with 40% omethoate EC 800 times solution or 73% Kete EC 1500 times solution.

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