【1】Break the dormancy of seed potatoes and promote growth

Gibberellic acid

Gibberellic acid has obvious germination effect. Low concentration and short-time treatment can increase the number of tubers sprouting, increase stems, and increase the dry matter rate, that is, increase the growth rate and enhance the growth potential of stems and leaves.In the early stage of germination, high-concentration or long-term gibberellic acid treatment significantly promoted the number of seedlings and the number of seedlings.Dip the potato pieces in 10-15 mg/L gibberellic acid solution for 10 minutes, or soak the seeds with 1 mg/L solution for 1 hour, remove them and dry them, and then raise seedlings in hotbeds, which can break the dormancy period and emerge early.

Naphthalene acetic acid

Bundle mustard and potato seedlings, soak the base with 10~20 mg/L liquid medicine to a depth of 1 inch (about 3.3 cm) at the base, and transplant the seedlings after 6 hours; or dip the seedlings with 80~100 mg/L liquid medicine for 3 seconds and plant them immediately, which can improve the survival rate , expand potato pieces, increase production.

Butyric hydrazide

The seedlings were soaked in 2500 mg/L liquid for 5~8 min before transplanting, which could promote rooting and improve the survival rate.

Choline chloride

When transplanting, soaking the incision in 20 mg/L choline chloride solution for 24 h can promote the growth of sweet potato hairy roots and early tuberous roots.

【2】Inhibit the leggy growth of potato vines and increase yield

Prohexadione calcium

Spraying 200-300 mg/L prohexadione calcium solution at the early flowering stage can significantly inhibit the vigorous growth of potato mango, promote the transfer of nutrients to the underground part, promote the expansion of potato pieces, and increase the yield.According to the test, the overall chlorophyll content showed a trend of increasing first and then decreasing, because the growth had been mainly transferred from the vegetative growth on the ground to the underground part.Prohexadione calcium treatment can effectively maintain the chlorophyll level of sweet potato plants, promote the accumulation of dry matter and the proportion of the underground part in the distribution of plant assimilation, which is beneficial to the accumulation and expansion of dry matter of roots, and the yield can be increased by 30%.

Choline chloride

Foliar spraying with 400-800 mg/L liquid medicine at the beginning of tuberous root and tuber formation or expansion, spraying once every 10-15 d, and continuous application 2-3 times can promote yield increase. The effect of compound naphthalene acetic acid is more significant.

Chlorhexidine

30 d after planting, 2500 mg/L of medicinal liquid per mu can be used for foliar spraying, which can control the leggy growth of potato vines and increase yield by 15% to 30%.

Formaline

When the vine grows to 0.8~1m (rapid tuber growth period), spray the whole plant with 200~-300 mg/L liquid medicine 1~2 times, and spray once in areas with little rain, and the fields with good fertilizer and water can be sprayed 15 times ~20 d and then spray 1 time.It can inhibit vegetative growth, control vine growth, prevent nutrient loss, and promote rhizome expansion. The yield of fresh potato increased by 5.39%~11.82%. The yield of dried potato increased by 10.08%~20.75%.

Paclobutrazol

Spraying 150-300 mg/L paclobutrazol solution on the leaves at the branching and tuber stage, with a liquid volume of 225 L/hm2, can significantly increase the chlorophyll content of leaves, the yield of tubers and the content of starch and protein, and reduce the disintegration of starch. It can significantly increase the glucose content of tubers, reduce the sucrose content of tubers and the minimum starch viscosity value, and can reduce the maximum vine growth of 24.09% sweet potato, promote the formation of potato pieces, and have obvious effects of increasing yield and quality.

Uniconazole

Spraying with 30-50 mg/L liquid medicine at the initial stage of potato block expansion can control vegetative growth, promote underground potato block expansion, and increase yield.

Ethephon

Foliar spraying of ethephon can inhibit the growth of sweet potato vines, significantly increase the chlorophyll content of leaves, root tuber yield, starch and protein content, reduce the disintegration value of its starch, significantly increase the sucrose content of tuberous roots, and reduce its maximum starch viscosity value.During the ridge sealing period, 2000 mg/L ethephon was sprayed on the leaves and the liquid volume was 225 L/hm 2, which could reduce the maximum vine length of sweet potato by 37.33%.

【3】Induce flowering and fruiting

6-BA

The combination of grafting and short-day treatment was adopted, and the treatment was started when the grafted seedlings were 40 cm long. 25 mg/L6-BA treatment could promote sweet potato budding and induce sweet potato flowering and fruiting.

Naphthalene Acetic Acid (Sodium)

The combination of grafting and short-day treatment was adopted. The treatment was started when the grafted seedlings were 40 cm long, and 50 mg/L naphthalene acetic acid (sodium) treatment could promote sweet potato budding, induce sweet potato flowering and fruiting.

Gibberellic acid

The combination of grafting and short-day treatment was adopted, and the treatment was started when the grafted seedlings were 40 cm long. 0 mg/L gibberellic acid treatment could promote sweet potato budding and induce sweet potato flowering and fruiting.