【1】Promote the growth of seedlings

Gibberellic acid

Soaking seeds with gibberellic acid 5~10 mg/L for 12~24 h can promote germination, stimulate hypocotyl elongation and increase dry weight, and seedlings emerge significantly earlier.After soaking sorghum seeds with 10 mg/L gibberellic acid solution, rhizome elongation was stimulated, which was 1.2 cm longer than the control.The rate of emergence and fresh weight of shoots were also greatly increased after treatment.

【2】Dwarf plants and reduce lodging

Chlormequat

Spraying chameleon at the jointing stage can effectively control the plant height of sorghum, achieve densification and increase yield, and improve grain quality.At the jointing stage, 5000 mg/L, 2000 mg/L, 1250 mg/L, 909 mg/L, 714 mg/L chlorophyll were sprayed respectively. The results showed that the dwarfing effect on sorghum plants at the heading stage was better than that of the water control. Increased by 5.43%, 13.18%, 3.10%, 3.88%, 8.53%;The dwarfing effect on sorghum plants at maturity was increased by 9.94%, 29.19%, 13.64%, 18.01%, and 14.91%, respectively, compared with the clear water control. Among them, the treatment with the concentration of 2000 mg/L was the best.

Ethephon

Spraying ethephon at the jointing stage can also effectively control the plant height of sorghum, achieve densification and increase yield, and improve grain quality.Spraying 4000 mg/L, 2000 mg/L, 1000 mg/L, 500 mg/L and 400 mg/L ethephon at the jointing stage respectively showed that the dwarfing effect on sorghum plants at the heading stage was higher than that of the water control. 29.32%, 34.58%, 21.80%, 21.8%%, 2.18%, the dwarfing effect on sorghum plants at the mature stage was 21.07%, 22.16%, 19.77%, 18.63%, and 12.11% higher than that of the clear water control, respectively. Among them, the treatment with the concentration of 2000 mg/L was the best.

On sorghum, the dwarfing effect of spraying ethephon is more significant than that of chlorophyll, which can reduce the height of the center of gravity, improve the bending resistance of the stem, and enhance the mechanical strength of the stem, thereby enhancing the bending resistance and lodging resistance of the plant. .However, there was little difference in improving sorghum photosynthetic index, chlorophyll content and grain quality.

【3】Reduce storage loss

Gibberellic acid

7 days before harvest, spraying 40 mg/L gibberellic acid on the whole plant of sorghum could prolong the storage period of sorghum stems to 90-120 d, and increase the sugar content of sorghum stems by 40.5%.

Naphthalene Acetic Acid (Sodium)

7d before harvest, spraying 70 mg/L theaacetic acid (sodium) on the whole sorghum plant can prolong the storage period of sorghum stems to 90-120 d, and increase the sugar content of sorghum stems by 27%.