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Soil pH and Fertilizer. Keep the soil pH more acidic, around 6.0 to 6.5. You can test the soil pH every few growing seasons and add dolomite limestone to raise the pH if necessary. You can add sulfur to lower the pH. When growing grapefruit in Florida, fertilize the trees three times a year with a citrus fertilizer; in California, only add nitrogen. Your best bet is to have the soil around the root base tested to make sure your grapefruit tree has all the nutrients it needs.
The other fruit trees around mine are still a nice, bright green. I live in Sun City Grand, and the ground around the tree is rock. I could use all the help I can get. Answer: Sounds like your grapefruit tree is lacking nitrogen. I would use a citrus fertilizer â preferably one higher in nitrogen. Always follow instructions and rate application. I would also make sure you are watering at the drip line and not at the trunk. The drip line is the area where the canopy lines up with the ground.