When will the spring oil sunflower be planted? How many times can oil sunflower be planted a year?

1. The planting time of spring oil sunflower is from March to April in spring, mostly in the south, and the planting in the north needs to be carried out in greenhouses or greenhouses. The maturity of spring oil sunflower is from July to September. Dry seeds can be picked in autumn. Before planting oil sunflower, put the seeds in the sun, disinfect them and sow them. Soak the seeds in warm water for 1-2 days before sowing. Plant spacing is about 45 cm, sowing depth is 4-5 cm, and a certain density is maintained.

Generally, oil sunflower can be planted twice a year. Sow it once in spring and once in summer. The amount of seeds used for planting an acre of oil sunflower is about 400-500 grams, the planting density is 60 cm, the spacing between plants is 30 cm -33 cm, and the sowing should be shallow rather than deep. It can also be planted in beds 5 cm deep and 30 cm apart. After sowing, it can be kept moist and cured, and it can emerge after 4 days. After planting oil sunflower, apply appropriate amount of organic fertilizer or farmyard manure in cooperation with autumn tillage to avoid repeated cropping, loosen soil reasonably and water reasonably. If the flowering period just catches up with the rainy season, it will cause a lot of production reduction.