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« on: April 24, 2014, 08:45:46 PM »
Mark In The Great State Of Texas, Jack's 20-10-20 though not the very best formula for citrus, is really not all that bad. Citrus like high nitrogen and potassium, and just little phosphorus. 20-10-20, a 2-1-2 ratio fertilizer, offers both high N & K with too much P. Jacks 25-5-15 W/TM is a relative new formulation of Jacks (Peters Company). Jacks main customers are the nursery trade, and not citrus. As said above, research shows that citrus absorb nutrients from the soil in a 5-1-3 ratio, Meaning for every 5 parts N, the tree will absorb 1 part phosphorous and 3 parts potassium. Therefore, Jacks 25-5-15 is a 100 percent correct balanced fertilizer, especially for container citrus trees. If you would like to read further about citrus's 5-1-3 ratio, you will find it in the citrus text book titled "The Genus Citrus" written by Dugo and Giacomo. - Millet