Abstract
Polyurethane‐based foam plugs used as supports for aeroponically grown soybean plants [Glycine mu (L.) Merr.] contain a phytotoxic compound. Plugs were detoxified after soaking in 1.0 M NaOH for 1 h and then in 950 mL L−1 ethanol for 12 h. Five additional foam materials were evaluated as substitutes for polyurethane foam plugs. Four of the five foams tested (reticulated ether‐based foam, etbafoam, Dowstrand foam, and L/C 200 foam) were nontoxic to soybean plants. Of these, reticulated ether‐based foam (39.4 or 31.4 pores cm−l) had physical properties similar to polyurethane foam and is recommended as a substitute for this material.
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