How to reduce the empty shell of sunflower?

The main reasons for the empty shell of sunflower are drought and lack of water and poor pollination. The ways to reduce empty shells are as follows: 1. Water it in time. Especially from budding to flowering, there is no shortage of water. two。 adequate manuring. The principle of fertilizing sunflower is the combination of base fertilizer, seed fertilizer and topdressing, and the combination of agricultural fertilizer, chemical fertilizer and micro-fertilizer. The combination of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer, the base fertilizer is mainly farm fertilizer, the amount of fertilizer per mu is more than 2000 kg, the amount of seed fertilizer is less, phosphate fertilizer and plant ash are available, diammonium phosphate per mu is 15 kg, plant ash is 40 kg, topdressing is mainly ammonium nitrate, urea, ammonium bicarbonate and potassium fertilizer, nitrogen and potash are generally applied in 7: 8 pairs of leaves, and the effect is better. The appropriate depth of fertilization is 10-15 cm to improve the utilization rate of chemical fertilizer. 3. Artificial pollination. Artificial pollination is usually carried out at 9: 11 am every morning, that is, after the dew is dry, no later than 12:00 at the latest, usually pollination for 2 or 3 times or 3 times.