What are the ways to increase the sweetness of grapes?

Spray rare earth. Foliar application of rare earth can increase the sugar content by 0.6 degrees and increase the yield. The method of use is to spray 0.05% of rare earth nitrate solution during softening of the fruit. The spraying site is mainly based on young leaves and leaves. The spraying time is best chosen in the sunny afternoon or cloudy day to avoid the effects of spraying or rain erosion after spraying. If it rains within 24 hours after spraying, it should be sprayed again.

Spray grape coloring sugar enhancer. When the fruit is sufficiently softened and some of the fruit turns slightly purple, one week before picking and selling, 150-300 times more grape coloring sugar enhancer is evenly sprayed on the ear to promote coloration and improve sweetness.

Spraying hormones. There are mainly regulated phosphine and booster, which can increase the sugar content by 1 or 0.6 degrees, respectively. The method of use is: when the fruit begins to soften, apply a 500-70010-6 modulating phosphine solution, or a 1000-150010-6 cheeryme solution. The spray site is also dominated by young leaves and leaves. The spray should be uniform and wet.


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