This one is a bugger. Here's my. rough average soil conditions, about 100 soil tests compiled. A few tissue tests were performed and confirmed the soil test data. pH 7.7 CEC 18 Ca per acre, 5000 + lbs Fe per acre 85 lbs Mn per acre 8 lbs Not listing all the others because the main point is that I'm dealing with alkaline calcareous soils with quite low Mn availability and antagonism due to high Fe. Problem trees are acid preferring, red maple, birch, dogwood, etc. Mn is poorly available in these soil conditions and Mn chelates have poor stability for the same reasons. Some of these jobs have come about because previous fertility work by other companies was ineffective or flat out misdiagnosed as Fe problems (common mistake around here I'm afraid). Expanding beds and incorporating OM is usually the best place to start but as many of you know...it can be bloody hard to convince some folks to shrink their damn lawn areas. Some folks do respond well when I explain the chemistry and biology differences between forests and grasslands however. Depends on the customer. Not terribly interested in foliar or trunk injected treatments if I can help it. So far, the best treatment Ive tried is soil injecting Brandt 13% Mn edta at about .25 lbs per 1000 ft sq ammonium sulfate at roughly 1 lb N per 1000 ft sq, a humate product at 8 oz per 1000 ft sq, and my water is acidified because it comes from our production nursery. Anybody else have any suggestions? I know it's not easy and there is no perfect solution but someone must know methods better than I.