Sunflower is a crop that needs more fertilizer. From the formation of the disk to the flowering stage, it is the peak of sunflower's fertilizer requirement. More phosphorus is needed from emergence to disc formation, more nitrogen is needed from disc formation to end of flowering, and potassium is most absorbed from disc formation to wax maturity.

Therefore, sunflower is fertilized, with phosphorus in the early stage and nitrogen and potassium in the middle and late stages. Phosphorus and potassium fertilizers are mostly used as base fertilizer or seed fertilizer, while nitrogen fertilizer is used as top fertilizer or 1/3 as base fertilizer and 2/3 as top fertilizer.

1. Base fertilizer

Organic fertilizer combined with chemical fertilizer. Fertilizer dosage, organic fertilizer 1000-2000 kg per mu, with 18-18-18, 22-16-16 and other balanced or high nitrogen compound fertilizers, deep application below 15 cm, 40-60 kg per mu, also visible It depends on local conditions.

2. Planting fertilizer

Fertilizer is mainly used as fertilizer to achieve the purpose of strengthening seedlings. Apply 18-22-14 high-phosphorus compound fertilizer or 16-24-14 high-phosphorus compound fertilizer, combined with sowing, apply chemical fertilizer 2-3 cm under the seed, or 3-4 cm beside the seed.

3. Top dressing

Top dressing should apply high nitrogen, high potassium compound fertilizer, in addition to a part of trace elements such as zinc, molybdenum, manganese, copper. Recommend 17-6-25 or 20-6-20 high nitrogen and high potassium compound fertilizer, which added activated humic acid, can improve the soil, fertility, stimulate crop growth, improve product quality, especially add trace elements to improve The nutrient utilization rate of N, P and K improves crop yield and quality.