【1】Break seed dormancy

Gibberellic acid

The commonly used concentration is 50~100 mg/L, soaking the seeds for 12 h can break the dormancy barrier of seeds and promote germination.

6-BA

Seeds were treated with 20 mg 6-BA per kilogram of seeds, and the seeds were mixed well and sown to promote seed germination.

【2】Promote vegetative growth

6-BA

Use 20~40 mg/L benzylaminopurine to spray once at 10~15 d intervals, 2~3 times in the seedling stage, clustering stage and rosette stage, which can increase chlorophyll, improve photosynthesis, and accelerate the growth and development of crops ,increase production.

Triacontanol

0.5~1.0 mg/L triacontanol was sprayed once at the rosette stage and in the early stage of the heart. After treatment with triacontanol, the plants had strong growth, fresh leaves, enhanced disease resistance, and early maturity. 2 ~~5 d, the yield increased by 10.8%~16.3%.

Sodium Nitrophenolate

Use 4~6 mg/L sodium nitrophenolate solution to spray 3~4 times at the initial stage of planting, rosette stage and leaf bulb formation stage.Spraying 50 kg of medicinal liquid per acre can promote rooting, reduce diseases, promote growth, improve quality, mature early, and increase yield by 20% to 30%.The cabbage is sprayed 2~3 times on the leaves after planting, with an interval of 7~10 d each time, and spraying 50 kg of liquid medicine each time can promote the yield increase by 10%~20%.

Yield

In the cardiac period, spraying twice with 20-30 mg/L liquid medicine can obviously promote growth and increase yield.

Diethyl aminoethyl hexanoate

Spray the stems and leaves with 50~66.7 mg/L liquid medicine evenly for 3 times in the seedling stage, rosette stage and head stage, which can improve the photosynthetic rate and the activity of peroxidase and nitrate reductase;Improve the metabolism of carbon and nitrogen in plants, enhance the absorption of water and fertilizer by plants, and adjust the water balance in plants, thereby improving the drought and cold resistance of plants.

Brassinolide

0.013~0.02 mg/L rutinolide solution was sprayed once in the seedling stage and the vegetative growth stage, which can promote the obvious thickening of the mesophyll of cabbage, deepen the leaf color, and the fast growth speed can lead to early clustering, and the quality of the balls is good. Significant increase in births.

Diethyl aminoethyl hexanoate and brassinolide

5% Brassinolide and diethyl aminoethyl hexanoate (0.001:5) were sprayed with 1000-1500 times the concentration of the medicinal solution in the rosette stage, and reapplied at 10d intervals, which could significantly increase the yield, which was significantly higher than that of a single dose.Or in 30 days after sowing, when the Chinese cabbage leaves 10-11 leaves, the yield increases greatly, the concentration is preferably 1000 times, and the final yield increases by 15.73%.

Gibberellic acid

When the non-heading cabbage grew to 4 true leaves, it was treated with 20-75 mg/L gibberellic acid twice. After 20 days, the length and width of the leaves were increased compared with the control, and the yield could be increased by about 40%.

【3】Promoting/inhibiting bolting

Gibberellic acid

For vegetables that require low temperature vernalization to bolt and bloom, gibberellic acid can be used to induce the completion of the vernalization stage.Spraying plants or dripping growing points with 50~500 mg/L gibberellic acid solution can make two-year-growing sunshine crops early bolting and flowering under short-day conditions before overwintering.

Yiyadan

From September to early spring in warm regions, split bulbs and bolting will be a problem. In spring cultivation, from sowing to emergence, seedlings are always under low temperature conditions, and bolting often occurs.Therefore, it is often necessary to raise seedlings in hotbeds, and it has been cultivated under thermal insulation conditions until mid-September to prevent it from bolting. Spraying Yiyadan (Qingxiansu) has the effect of inhibiting bolting.Use 1000~3000 mg/L liquid medicine, spray 50 kg per mu. The spraying period is in the core or ball forming stage, and flower buds are also formed, but before the elongation, about late November to early December.After spraying green fresh element, bolting was inhibited, cracking ball was reduced, and the number of healthy and intact Chinese cabbage was increased.However, after spraying, it has some influence on the development and growth of the heart leaves, so that the ball of the bag does not feel tight, but it does not affect the appearance. However, it should be noted that due to toxicity and residue problems, the use of Yiyadan should be implemented in accordance with national policies.

Paclobutrazol

Spraying with 100 mg/L paclobutrazol at 7 true leaves, 5 times in a row, delayed the flowering of bolting-prone cultivars in suppressing plant height.

【4】Prevent detachment and promote storage and preservation

2,4-D

Spraying with 20-40 mg/L liquid in sunny afternoon 3-15 days before harvest can effectively prevent Chinese cabbage from falling off during storage and has a fresh-keeping effect.Generally, the concentration of storage for about 120 days is 40 mg/L; for storage (about 60 days, 20-30 mg/L is appropriate.To prevent Chinese cabbage from falling off during storage, 3~7d before harvest, spray with 25~50 m, 4-D liquid until the outer leaves are soaked, and dry the outside before storing in the cellar to prevent storage or transportation. Chinese cabbage is a lot of off.

Chlorophenoxyacetic acid

7~14 d before harvest, spraying 20~40 mg/L p-chlorophenoxyacetic acid can keep the leaves green and prevent debonding.

Methyl naphthalene acetate

After harvesting, each ton of cabbage is sprayed or sprayed with 50g methyl naphthalene acetate to prevent the cabbage from falling off.