Apply 2 1/2 to 3 lbs. Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5 per inch of trunk diameter annually in the early Spring before new growth appears and after Harvest. Apply around drip line. So you would apply 20-24 lbs per year for that size pecan tree (10-12 lbs in Spring and 10-12 lbs after Harvest) per product label instructions.
According to the manufacturer, Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5 should not be used in containized plants. CitrusGain 8-3-9 Fertilizer Blend would be a great choice for your specific needs.
Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5 can be applied to Nut, Citrus & Fruit Trees: Pecans, Hickory Nuts, Black Walnuts, Hazelnuts, Chestnuts, Apples, Pears, Peaches, Plums, Cherries, Oranges, Grapefruit, Lemons. Please provide your targeted pest for information on treating your blueberry bushes.
For a grapefruit tree with 8 inch trunk diameter, you would apply 8 lbs of Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5 per feeding in Spring, Summer, and Fall at 90 day intervals, per the product label. For lemon and orange trees, you would use the same amount of 1 lb per inch of trunk diameter at each feeding.
For citrus trees, you will apply 1 lb or 2 cups of Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5 per inch of the trunk diameter per feeding in Spring, Summer and Fall.
According to the instructions on the product label for applying Ferti-Lome Fruit, Citrus and Pecan Tree Food 19-10-5, to citrus trees, "Apply 1 lb. of fertilizer per inch of trunk diameter per feeding in early spring, summer, and fall at 90 day intervals."
Per the product label for Ferti-Lome, Citrus and Pecan Tree Food 19-10-5 you would apply 2.5-3 lbs. of product per inch of trunk diameter annually in the early spring before new growth appears and after harvest, around the drip line of the tree.
We would recommend consulting an arborist (tree expert) for specific questions regarding your pecan trees, as this is above our level of expertise. You could also reach out to your local cooperative extension office, which should be able to advise on treatments, and direct you to local experts in your area.