Grape extra-root top dressing
Fertilizer outside the root is a commonly used fertilization method for grape production, with a small amount of fertilizer, high utilization and quick results. The types of fertilizers used for topdressing outside the roots of grapes and their spraying concentration should be determined according to the time and purpose of fertilization.
The flowering period is mainly to prevent the flower and fruit from falling off, generally after 3 to 5 days after flowering, spraying 0.3% urea and 0.3% borax solution 50 kg per mu.
The expansion period of young fruit is mainly to increase the photosynthetic efficiency of leaves and promote the expansion of young fruit. The nitrogen-rich vineyards can spray 3 kg of superphosphate 50 kg per acre and spray it once every 10 days. If there is a lack of nitrogen, 0.2% urea can be added.
The coloring period is mainly to promote the coloring, speed up the maturation, and increase the berry sugar content. Usually after the hard core period, spraying with 0.3% to 0.5% potassium dihydrogen phosphate solution, about 7 days, even sprayed 2 to 3 times, each spraying 50 kilograms per acre.
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