Abstract
Nitrate-N was an inferior source of N for both Sitka spruce and Scots pine, resulting in lower dry weights and moderate chlorosis of newly developing needles. The NO3-N source resulted in a greater cation concentration in the tissues and a greater organic anion content as measured by the difference in inorganic cations and inorganic anions. Chlorosis was partially alleviated when additional Fe was supplied as FeEDDHA and there was a slight decrease in organic anions (C-A). It is suggested that the chlorosis might be explained by the competitive chelation hypothesis which states that the activity of the Fe is reduced by metals or various ligands, in this case by the excess organic anions produced by NO3-N nutrition.
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