The principle of fertilization is to apply enough base fertilizer, re-apply fertilizer, and apply it at a proper time. The base fertilizer is mainly based on farmyard manure. It is better to use pig manure and decomposed manure . The average field is 1,500 to 2,500 kilograms per mu , and the high-yield field should be applied for 3,000 to 4,000 kilograms. If the phosphate fertilizer is used as the base fertilizer, 30 kg of calcium phosphate is applied to the field , and about 50 kg is applied to the high-yield field . Potassium fertilizer can be applied to 50 to 75 kg of grass ash. However, no vegetation is used in the saline-alkali soil. Types of fertilizer use available nitrogen, phosphorus and potassium fertilizers, and is ready finely ground animal manure human urine. Use less and fine. Generally, 15 to 30 kg of calcium phosphate can be applied per acre , 10 to 15 kg of potassium chloride or potassium sulfate or 35 kg of grass wood ash . On thin hillsides or gravel soil, 4 to 7 kg of ammonium nitrate or 10 kg of ammonium sulfate should be added . The hole or strip can be applied to the seeding ditch. Topdressing is divided into seedling stage and topdressing. Seedling stage topdressing one year of ripe spring sowing sunflower, generally not applied when the base fertilizer or seed fertilizer is sufficient. Sunflowers sown in summer and autumn need to be applied to seedlings. The key period of flowering and topdressing sunflower is to be before the bud. Nitrogen and potassium fertilizers are generally chased in 7 to 8 pairs of leaves, and topdressing without fertilizer application should be appropriate. Ammonium nitrate fertilizer per acre is generally 10 to 15 kg, 20 to 25 kg of ammonium bicarbonate, 7.5 to 10 kg of urea, superphosphate 20 kg, 15 kg of potassium chloride. Shi Shi or acupoint application. Boron fertilizer has a good yield-increasing effect on sunflower. Boron fertilizer should be added when the soil effective boron content is less than 0.4 mg/kg. It can be mixed with 150 grams of borax per acre , or sprayed with 0.1 to 0.2 percent borax aqueous solution before flowering .