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If the ph is too alkaline then the chelated iron will help appearance a lot. If you really want to take their money then you could sell them injections, which will give the fastest visual effects although I'm not sold on the long term effectiveness.

Around here they use limestone as a compaction base under the asphalt. This makes the soil very alkaline and our pines prefer a more acidic soil. The alkaline soil makes the trees look just as you describe. You may want to do a soil PH test to see if this is indeed the cause of your problem...