propel is a concentrated (10,000 mg/L) source of ferrous iron. This ferrous iron is a mixture of readily available and time- released iron. If iron is provided in the ferric form (Fe3+) then it must be reduced by the plant to the ferrous form (Fe2+) before it can be utilized. This process of conversion (known as reduction) requires the plant to expend physiological energy. propel provides iron already in the ferrous form thus enhancing iron utilization. In addition, propel contains a reducing agent that helps convert any iron present (such as iron from substrate) into the ferrous form.
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