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Medium-pH above 6.4 is a com mon cause of micronutrient defi ciency for container-grown plants, and technologies are required to correct an excessively high medium-pH. The objective was to quantify the dose response from application of sev er al acidic materials that have been rec om mend ed for lowering medium-pH in soilless media. A 70% peat/30% perlite (by vol ume) medium was mixed with a preplant nutrient charge, a wetting agent and 1.5, 1.8, 2.1, or 2.4 kg·m-3 of a dolomitic hydrated lime resulting in four starting pH levels ranging from 6.4 to 7.6. Aluminum sulfate (17% Al) at 1.8-28.8 g·L-1 , fl owable el e men tal sulfur (52% S) at 3.55-56.8 mL·L -1 , fer rous sulfate (20.8% Fe) at 1.8-28.8 g·L-1 , Seplex-L organic acid at 0.32-5.12 mL·L -1 , sulfuric acid (93%) at 0.08-2.56 mL·L-1 , 21.1N-3.1P-5.8K water-soluble fertilizer at 50-400 mg·L -1 N (potential acidity 780 g CaCO 3 equivalents/kg), and a deionized water control were applied at 60 mL per 126-cm3 container with minimal leaching as a single drench (except repeat sulfuric acid ap pli ca tions at 0.08 or 0.16 mL·L-1 and 21.1N-3.1P-5.8K treatments that were applied about every 3 days). Medium-pH and electrical conductivity (EC) were tested over 28 days using the sat u rat ed medium ex tract method using deion ized water as the extractant. One day after application, alu mi num sulfate, ferrous sul fate, and sulfuric acid lowered pH by up to 3 pH units at the highest concentrations and medium-pH remained fairly stable for the following 27 days. Flowable sulfur lowered pH gradually over the course of the experiment by up to 3.3 pH units, with no difference across the wide range in concentra- tions. Organic acid had minimal impact on me di um-pH, and 21.1N-3.1P-5.8K did not low er medium-pH despite the fact that all nitrogen was supplied in the am mo ni um and urea form. At rec om mend ed con cen tra tions, chemicals tested raised me di um-EC, but not above ac cept able levels for plant growth. The high est rates of alu mi num and ferrous sul fates, and sulfuric acid, how ev er, increased me di um-EC by 2.0 dS·m-1 on day 1. Me-

The pH-Response of a Peat-based Medium to Application of Acid-reaction Chemicals