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Have your soils tested. Many areas of the country (world) have excess AL++++ in the soils. This causes the pH to be lowered and plants cannot absorb water and phosphorous. I am seeking to test that idea and find a solution. Thanks to ATH above for at least one good article!

Thank you! This is the best article I have seen. I will use that information to test tree soil in my area and if of benefit, I'll let others know too. I am grateful for your help. If you run into any other articles I will be interested in them as well! Again, thank you.

Posts from all over the world are showing the decline of trees. Even after the wettest year on record, trees in Oregon are drought stressed. There is the possibility that aluminum toxicity could be the problem. Aluminum prevents the uptake of water and disrupts other nutrient absorption. If this...