Summary
Slash pine seedlings on Bladen, Leon, and Lakeland soils responded differently to P and N fertilization. Seedling growth was increased by all treatments on Bladen soil, whereas responses by seedlings on the other soils were nil. All soils were low in extractable P with both Bladen and Lakeland yielding 0.85 ppm P. Growth response to fertilizer was positive on Bladen soil because soil and tissue levels of P were raised above “critical” levels and other nutrients were present in adequate quantities. Tissue analyses indicated, and subsequent experiments utilizing macro- and micronutrients proved, that excess P applications reduced certain micronutrients to growth-limiting levels on both Leon and Lakeland soils. Best growth on Leon soil occurred when P and N were supplemented with Cu. On the Lakeland soil macronutrients supplemented with Cu, Mn, or Zn produced greatest growth. Toxicity levels of five micronutrients on the latter soil also were determined.
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Journal Series No. 3506, Florida Agricultural Experiment Station, Gainesville. Research supported by Cooperative Research in Forest Fertilization program.
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Van Lear, D.H., Smith, W.H. Relationships between macro- and micronutrient nutrition of slash pine on three coastal plain soils. Plant Soil 36, 331–347 (1972). https://doi.org/10.1007/BF01373488
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DOI: https://doi.org/10.1007/BF01373488