When to sow sunflower seeds?

Spring sowing of oil sunflower should be sown when the soil layer of 5 cm should be stable at 8℃～10℃ for 4 to 5 days. The suitable period in the central and southern regions of our province is early to mid-March. It can be planted from early May to August every year in the north.

Spring sowing should be done when the soil layer of 5 cm should be stable at 8℃～10℃ for 4 to 5 days. The suitable period in the central and southern regions of our province is early to mid-March. Single and double grains can be sown on demand in separate holes or 2 grains per hole, with a sowing rate of 400 to 500 grams per mu. The sowing density depends on the soil conditions. Generally, the row spacing is 50 cm, the plant spacing is 30 to 40 cm, and the sowing depth is 3 to 5 cm. About 4,000 seedlings per acre of fertile land and 4,000 to 4,500 seedlings per acre of thin land.

Oil sunflower requires less water in the seedling stage and has strong drought resistance. It is advisable to squat the seedlings to promote root growth. The flower bud stage is a critical period for water demand. If the weather is dry, it should be combined with watering and ditching to apply 20 kilograms of compound fertilizer per acre, and the depth of fertilization should be controlled at 8 to 10 centimeters. The flowering and grain-filling period is also a critical period for water needs. If there is a drought, water should be watered in time. Although oil sunflower is drought tolerant, it is not tolerant to waterlogging. If the rain is too heavy, the waterlogging should be drained in time. Most of the pollination of oil sunflowers is done with the help of insects. If the weather is bad or there are few pollinating insects during the flowering and pollination period, pollination can be completed by freeing bees or artificial pollination. Just rub the flower disks together and gently rub them together. :

Youkui is the abbreviation of "oil sunflower". It is one of the four major oil crops in my country. Sunflowers can be divided into two categories according to their different uses, namely oil sunflowers (oil sunflowers) and edible sunflowers (food sunflowers). Oil sunflowers are divided into conventional varieties and hybrid varieties. Generally, conventional varieties can be planted by themselves, but hybrid varieties cannot.

The basic characteristics are basically the same as other sunflowers. However, the seeds of oil sunflower are shorter and smaller, and the peel is mostly black and thin, accounting for about 20% to 30% of the weight of the seeds. The weight of one thousand seeds is 40 to 110 grams. (The seeds of edible sunflowers are longer, with mostly black and white stripes on the peel. The peel is thick, accounting for more than 40% of the weight of the seeds, and the weight of one thousand seeds is 100~200 grams).