Abstract
AbstractOptimum nutrient levels for loblolly pine (Pinus taeda L.) were estimated by applying DRIS techniques to 504 randomly selected trees from loblolly pine plantations in Georgia and South Carolina. Levels of 12.0 g/kg N, 1.1 g/kg P, and 0.8 g/kg Mg were determined through this method. These values were slightly higher than the generally accepted critical levels of 11.0, 1.0, and 0.7 g/kg for these nutrients, which illustrates the theoretical relationship between critical levels and DRIS optima. This study shows that DRIS methods applied to field survey data can be used to estimate optimum foliar nutrient levels while circumventing many problems associated with traditional critical‐level derivations.
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