A: Red Fuji apples are hi potassium varieties. Therefore, applying more potassium fertilizer after July will increase the fruit coloring index by 24.4% and the sugar content by 2.4%. In addition, foliar spray fertilizer is also a good choice, when the fruit near the coloring of spraying 500 mg / kg of rare earth solution, it can be coloring ahead of 12 to 17 days, the color index increased by 24.2%, the whole red fruit rate increased by more than 5%, sugary The amount increased by 0.9% to 1.6%, and increased the sugar-acid ratio of the fruit.
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