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The flowering period is mainly to prevent flower and fruit from falling off. Generally, 3 to 5 days after flowering, 0.3% urea and 0.3% borax solution 50 kg per acre are sprayed.
The expansion period of young fruit is mainly to improve the photosynthetic efficiency of the leaves and promote the expansion of young fruit. For vineyards with sufficient nitrogen fertilizer, 50 kg of 3% superphosphate leaching solution can be sprayed per acre, and sprayed again every 10 days or so. If nitrogen is deficient, 0.2% urea can be added.
The coloring period is mainly to promote coloration, speed up maturation, and increase the sugar content of berries. Usually after the hard core period, spray with 0.3% ~ 0.5% potassium dihydrogen phosphate solution, once every 7 days, even spray 2 to 3 times, spraying 50 kg per acre.
Grape three-stage root dressing
Top dressing is a commonly used fertilization method for grape production. It has the characteristics of low fertilizer consumption, high utilization rate and quick effect. The type of fertilizer used for the application of the grape roots and the spraying concentration should be determined according to the time and purpose of fertilization.
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