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→Amendments
<tr class ='success'><th>Material</th><th>Benefits</th><th>Potential concerns</th></tr>
<tr class ='success'><th>Material</th><th>Benefits</th><th>Potential concerns</th></tr>
<tr><td>[[Biochar]]</td><td>-</td><td>Currently expensive<br>Energy intensive to produce</td></tr>
<tr><td>[[Biochar]]</td><td>-</td><td>Currently expensive<br>Energy intensive to produce</td></tr>
<tr><td>[[Iron filings (ZVI)]]</td><td>-</td><td>May harm planting<ref>Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.</ref></td></tr>
<tr><td>[[Iron filings (ZVI)]]</td><td>Proven phosphorous retention</td><td>May harm plants<ref>Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.</ref></td></tr>
<tr><td>[[Red sand]]</td><td>Proven phosphorous retention</td><td>Proprietary</td></tr>
<tr><td>[[Red sand]]</td><td>Proven phosphorous retention</td><td>Proprietary</td></tr>
<tr><td>[[Sorptive media]]<sup>TM</sup></td><td>Proven phosphorous retention</td><td></td></tr>
<tr><td>[[Sorptive media]]<sup>TM</sup></td><td>Proven phosphorous retention</td><td></td></tr>