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if this serves to make for confusion the my are not blue, ( are 3 sabal pumos) Origin of seeds, not RPS, the seeds were very large I bought them in spring 2007

It looks good !

I disagree. The necrosis at the leaf ends does look like magnesium deficiency. the spotting isnt Mg deficiency. Because Mg is mobile within the plant, unlike K, the Mg concentrations will equilibrate and you wont get that very localized effect shown on your plant. Necrosis at the leaflet tips of th eoldest fronds can happen for any number of reasons, including cold damage, an advanced funcal infection. There's no fungus, I'm confident. The spotting I'm guessing is Potassium, but the consistent collapse and necrosis of older leaf tips looks like every Google picture I can find of palms with Magnesium deficiency. With a very low pH, this all makes sense. I do not see the classic intermediate symptoms of Mg deficiency at all, just necrosis at the end. From U of F horticultural dept on landscape palms http://ufdc.ufl.edu/IR00001730/00001 Magnesium Deficiency Magnesium (Mg) deficiency is rarely fatal, and, like Fe deficiency, is primarily a cosmetic problem in landscape palms. It is a common deficiency especially for Canary Island date palms, Classic symptoms of Mg deficiency are marginal chlorosis on oldest leaves, which progresses upward to younger foliage (Figure 16). In contrast to K deficiency symptoms of yellow-orange tissue in older leaves, Mg deficiency is distinguished by the typically broad, lemon yellow band along the margin of older leaves, with a green center and a distinct boundary between the yellow and green portions. When advanced, Mg deficiency also causes leaf tips to become necrotic. Symptomatic leaves will not recover if Mg deficiency is treated, and chlorotic leaves must be replaced with new healthy leaves. Coated or uncoated prilled kieserite can be applied to prevent or correct Mg deficiency.