Fly Ash and Composted Biosolids as a Source of Fe for Hybrid Poplar: A Greenhouse Study

<table>SPAD values (a), plant Fe (b), and total plant N (c) of the hybrid poplar clone OP-367 cultivated in soil amended with Fe EDDHA + UAN (urea ammonium nitrate), fly ash + UAN, and composted biosolids.  SPAD means are from two measurement periods.  Means with the same letter are not significantly different at <svg height="11.125" id="M53" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 57.549999 11.125" width="57.549999" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg> level for combined leaf and stem material.  Refer to Experimental Design and Statistical Analysis section for treatment codes.</table>

Applied and Environmental Soil Science

fig1

Figure 1

Figure 1: Fly Ash and Composted Biosolids as a Source of Fe for Hybrid Poplar: A Greenhouse Study 