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Root hair density and the inequality index as affected by ethylene precursor ACC or inhibitors (STS or MCP) under high (1000 μm) or low (1 μm) phosphorus concentrations. Under high phosphorus, root hair density increased with addition of ACC, but inequality decreased; the inequality increased in the presence of MCP but decreased in the presence of STS. Under low phosphorus, root hair density decreased with STS and MCP, but the inequality increased. Error bars indicate standard errors.
