When do you plant oil sunflower in the south?

Oil sunflower is usually planted in late spring and early summer, usually from May 5th to 10.

Key points of oil sunflower cultivation techniques?

1. Cultivation techniques of single oil sunflower?

1, fine soil preparation, base fertilizer?

Generally, the land should be ploughed in time after the autumn harvest in the first year, and more than 3,000 kilograms of farmyard manure, 50 kilograms of phosphorus and 40 kilograms of ammonium bicarbonate should be applied per mu in combination with autumn ploughing. Fill the water in winter, rake the soil as early as possible in early spring, so that the soil is broken and flat, and the upper part is weak and the lower part is solid. Apply/kloc-0.5 kg diammonium phosphate and 7.5 kg urea before sowing. ?

2. sow at the right time?

Generally, it is advisable to sow from May 5 to 10, and the sowing date in fields with good soil moisture is appropriately advanced. Fields with poor soil moisture or heavy salt content should be sown after irrigation, with a sowing depth of 4cm and 2 grains per hole. The variety is American "C 10 1" oil sunflower. ?

3. Reasonable close planting?

Generally, large and small rows are used for single planting, that is, large row spacing is 80cm, small row spacing is 40cm, plant spacing is 25cm, 4,400 seedlings are left per mu, and the sowing amount per mu is 7-8 Liang. ?

4. Site management?

(1) check and replenish seedlings: check and replenish seedlings in time after emergence, and transplant with soil or accelerate germination and replant in time when real leaves are aligned with 1. ?

(2) intertillage weeding, timely soil cultivation: intertillage weeding is started when the true leaves are 1, generally 2-3 times, and intertillage soil cultivation is combined with 10cm when the seedling height is 50cm to prevent lodging. ?

(3) Timely irrigation and reasonable topdressing: irrigation for 3 times and topdressing for 2 times during the whole growth period. Generally, 25 days after emergence, after 7-8 true leaves, top water is applied, followed by urea 10- 12.5 kg per mu, 2 water in bud stage, 3 water in flowering stage and 20 kg urea per mu. ?

(4) foliar spraying and auxiliary pollination: foliar spraying micro-fertilizer from budding to flowering, and artificial auxiliary pollination can be carried out for 2-3 times when flowering. ?

(5) Timely harvesting: when the back of the sunflower disk turns yellow and the edge of the disk turns brown, it can be harvested.