As a kind of popular fruit, grapes have different prices among different varieties. This is not related to their sweetness, which directly affects the economic benefits of farmers. How to further improve the sweetness of grapes? The following methods are effective:
1 spraying rare earth: foliar spray rare earth, can increase the sugar content of 0.6 degrees, and can increase production. 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.
2 Spraying grape coloring sugar-enhancing agent: When the fruit is softened enough 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. .
3 spraying hormones: mainly modulate phosphine and booster prime, respectively, can increase the sugar content of 1 degree and 0.6 degrees. The method of use is: when the fruit begins to soften, apply a 500-70010-6 modulating phosphine solution, or a 000-150010-6 cheeryme solution. The spray site is also dominated by young leaves and leaves. The spray should be uniform and wet.
4 increase organic fertilizer: In the fruit expansion period, per acre with 50 kilograms of compost manure plus peanut cake or sesame cake fertilizer 1 kg, ring groove, and then cover the soil, sweetening effect is good.
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