First, pre-broadcast preparation

1. Select improved varieties. Select high-yield, stable yield, disease-resistant varieties.

2. Seed treatment. Sun seeds 1-2 days before sowing to improve germination rate. Seed dressing with medicament can effectively prevent downy mildew of oil sunflower in seedling stage. The seeds were treated with 25% metalaxyl WP or 25% dimethomorph at a dosage of 0.2% -0.3% by weight of seeds.

3. Apply base fertilizer. Can use autumn turn winter irrigation and spring turn spring irrigation, irrigation to uniform, high no leakage, low non-flooded, the amount of irrigation 70-80 m3/mu. Before ploughing, the soil should be fertilized reasonably according to the fertilization index, 10kg diammonium fertilizer, 5kg potassium fertilizer and 1.5 kg zinc fertilizer per mu, and then deeply ploughed into the soil. The day before sowing with a light disc harrow or nail teeth Harrow soil, Harrow depth 8 -10 cm, to“Even, flat, clean, broken, loose, moisture,” the six-word standard.

Four. Soil treatment. In order to prevent grass weeds in the field, it is necessary to mix with 40% trifluralin (80-100 g/mu) or pendimethalin (160-180 g/mu) and water (30-40 kg/mu) before sowing, then spray it on the ground which has been plowed and raked once, the seeds will be sown after a day and night.

Sowing

1. Sow in time. When the soil temperature reaches 5 ° C, the sowing begins. The general sowing time to the east of Hazhibuhu town is from late March to April 15, and the general sowing date to the west of Hazhibuhu town is from April 5 to April 25. The years with more rainfall should be later in suitable sowing time, avoid the adverse weather of high temperature and precipitation, and improve the pollination rate and disease resistance.

2. Sowing amount. Air-suction seeder, Sowing 300-400 g/mu.

3. Sowing quality. Oil sunflower seeding requires sowing straight, up and down neatly, the same depth, seed even, no weight not leakage, accurate sowing, suitable sowing depth, good soil cover, accurate relay, end to end.

Four. Deep. The requirement of sowing depth is consistent, generally 4-5cm, soil cover is strict, no floating seed phenomenon, early sowing should be shallow (3-4cm) , late sowing should be deep (4-5cm) , after sowing the seeds and soil compaction, sowing should be straight, continuous line.

5. Row spacing configuration. Using small border planting, border distance 90cm, each border 2 rows, row distance 45-48cm, plant distance 22-24cm.

Management of seedling stage

1. Check seedlings and replant. When sowing, find broken row and timely replant; after emergence, found lack of seedlings, broken row, immediately accelerate germination and replant to ensure the whole seedling.

2. Morning seedling, fixed seedling. In order to cultivate strong seedlings, usually in a pair of true leaves between seedlings, fixed seedlings, two pairs of true leaves, the end of fixed seedlings, required to remain uniform, remain strong seedlings, do not leave two seedlings.

3. Ploughing and weeding. We should cultivate early and deep. After the seedlings are in use, early and mid-tillage, the depth of 16-18cm, to prevent pressure seedlings, injury seedlings. After seedling fixing, the second intertillage was carried out, and weeds between plants were uprooted by combining seedling fixing.