The reason why sunflowers produce empty shells is mainly due to drought and lack of pollination. Ways to reduce shells are:
1. Watering in time. Especially budding to flowering can not be short of water.
2. Reasonable fertilization. The principle of fertilizing sunflower is combining basic fertilizer, seed fertilizer and topdressing fertilizer; combining agricultural fertilizer, chemical fertilizer and trace fertilizer; combining nitrogen fertilizer, phosphate fertilizer, and potash fertilizer; base fertilizer is mainly farmyard manure; the amount of Mushi is more than 2,000 kilograms; Phosphate fertilizer and plant ash, Mushi DAP 15 kg, plant ash 40 kg, Topdressing fast-acting ammonium nitrate, urea, ammonium bicarbonate and potash fertilizer, nitrogen fertilizer and potash fertilizer generally applied in the 7 to 8 leaves, the effect is better , Top dressing method Shihe points, Shixue Shi better. Fertilization depth of 10 ~ 15 cm is appropriate, improve the utilization of chemical fertilizers.
3. Artificial pollination. Artificial pollination time is generally 9-11 am every morning, that is, after dew dry, the latest can not be later than before 12 o'clock, generally pollination can be 2 to 3 times or 3 to 4 times.
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