According to the test, the use of gibberellin roselle grapes can achieve a seedless rate of about 95%. The use of gibberellin is suitable for grape varieties of non-nuclear white and rose dew. Usually, the gibberellin lOOmg/L solution is soaked in the inflorescence about 14 days before the flowering, and the vibration is fully applied to make the pollen lose its germination power. Make the fruit smaller. Therefore, about 9 days after the flowering, the gibberellin l00mg/L was used to soak the ear 1 time. In large-scale grape producing areas, gibberellin can be sprayed at a rate of 100-200 mg/L for about 12 days at the beginning of the flowering. Note that it is sprayed on the inflorescence and cannot be sprayed on the leaves. Note that gibberellin enriched fruit is only suitable for some grape varieties. Kyoho grape can not play this role. Instead, it will form small fruit and green fruit, which will affect the edible value. 

Therefore, it is necessary to adapt to other grape varieties on the basis of experiment. Gibberellin can also improve the effect of seedless fruit fruit setting on other European seedless varieties and seeds that are easily aborted and granulated, but low concentration of gibberellin (<20mg/L) promotes shoot growth. On the contrary, it causes the fruit to fall off, especially during the flowering period, which can reduce the yield.

2,4-d

Spraying the flower clusters with a 10 mg/L solution can make the ovary not expａnd and form seedless fruits, which can increase the yield of the grapes.

Gibberellin + streptomycin

After treatment with gibberellin 100mg/L+ agricultural streptomycin 400mg/L, the nucleus inflorescence reached 95%, and promoted early fruit ripening and increased soluble solid content. Although the black-free cr has a nuclear-free rate of 98% after treatment, the small fruit granules increase and the ear weight is significantly low, so it is not used.

CPPU

The grapes were treated with CPPU 15mg/L and gibberellin 20mg/L for 5 days before the flowering, and treated with gibberellin 15mg/L 10d after the flowering, which can induce the formation of the seedless grape. The seedless rate can reach 99%. The average grain weight of seedless fruits is 6.97~9.08g, the fruit detachment rate is only 8.7%, and the maturity period can be advanced by 10~15d.

Gibberellin + p-chlorophenoxyacetic acid

Induced nuclear-free fruit Kyoho, alone or gibberellin chlorophenoxy acetic acid treatment effect is not satisfactory, not reach more than 90% nuclear, and serious injury, and the gibberellin 10 ~ 15mg / L The liquid was added with p-chlorophenoxyacetic acid 15mg/L solution and the flower was impregnated 5d before flowering. The rate of no-nuclear rate was as high as 97.1%-99%. The phytotoxicity was alleviated, the fruit was stable, and the flesh was well developed. After 10 to 14 days after anthesis, the gibberellin 25 mg/L solution was used for treatment once, and the fruit granules increased significantly. The maturity period was 10-15 days earlier, and the economic benefit was obvious. Note: It should be used strictly according to the specified concentration, otherwise it will cause phytotoxicity. When dispensing the medicine, first dissolve the powder with a small amount of hot water, and then add the full amount of water according to the concentration. This medicine can not be mixed with alkaline fertilizer and pesticide.

Gibberellin + antibiotics

Jufeng grape flowering period with 200mg / L kanamycin + 200mg / L streptomycin + (50 ~ 150) mg / L gibberellin, no nuclear rate of 99%, the second and third general use of fruit enlargement agent .

Zhengzhou Delong Chemical CO., Ltd. is the production base of plant growth regulators in China, which established in 2009, specializing in offering plant protection products. If you have any question, contact us any time.