How to prevent sunflower shells

How to prevent the sunflower shell? Please introduce that the empty shell of the outer ring of sunflower is mainly caused by poor pollination; the empty shell of the center of sunflower is mainly caused by lack of fertilizer and water and lack of nutrition. Therefore, to prevent the empty shell of sunflower is to ensure adequate fertilizer and water, and the second is artificial pollination. First, strengthen the management of fertilizer and water. The quality of water and fertilizer conditions of sunflower is closely related to the empty shell rate and the increase of yield of sunflower. The experiment shows that the empty shell rate of sunflower with sufficient fertilizer and water is only 3.5% and 5%. The second is to strengthen artificial pollination. In the case of insufficient pollination by insects, artificial pollination is an effective way to improve the seed setting rate. Artificial pollination was carried out when the sunflower entered the flowering stage for 2-3 days. During artificial pollination, a soft brush was used to gently touch the disk to make the pollen grains of stamens stick to the soft brush, and then the soft brush was pollinated in the same way to another sunflower disk. Click to get more sunflower planting techniques click to get more grain and oil crop planting techniques