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Bone meal is a good source and so is rock phosphate which is made from rocks. Rock Phosphate works better in acidic soil though than it does in alkaline soil.
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I tried to do some research on phosphorus absobtion and soil ph. What I found were scientific studies, which are hard to figure out since I am not a plant biologist/scientist. What I could find seemed to be saying that phosporus absorption is best for most plants with a neutal soil PH. You can check your soil PH with an inexpensive kit available at most plant centers. Forsythia prefer a PH of 5.5-8.0. If your soil is below that add lime and if above that add sulfur or peat.
My husband's yard babies (aka - forsythia bushes) did not do well last year at all. When he asked at the nursery, they recommended putting a (chemical) fertilizer on them that is high in phosphorus. Is there an organic alternative? I read that Bone Meal is high in P, but that the soil Ph will determine the amount of phosphorus absorbed from bone meal. I'm not sure we're that high maintenance, so I'm hoping there's an easier solution... Anyone?
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