At the end of June and early July, the orange fruit began to rapidly expand. At this time, calcium and magnesium must be applied to the roots. For trees over 5 years old, apply 0.45 to 0.50 kg of calcium nitrate and 0.75 to 1 kg of magnesium sulfate per plant, dig deep and 25 to 30 centimeters around the canopy drip line, and mix the calcium magnesium fertilizer thoroughly and evenly. Spread in the ditch, covering the soil. At the same time, once every 7 to 10 days, foliar spray one 800-time aqueous solution of boron-calcium-magnesium-one, continuously spraying 2 or 3 times, and evenly spray all the leaves and fruits to start dropping drops of water. In this way, not only can the sugar orange fruit expand rapidly, but also it can prevent cracking, increase sugar content, make the skin smooth and glossy, and obviously increase the yield and improve the quality.
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