A comparison of techniques for monitoring pH of growing medium

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Abstract
Studies were conducted to determine the reliability of four techniques for prolonged pH monitoring of small containers of media. Correlation coefficients of the methods tested (with saturated paste) were 0.96, 0.95 and 0.92 for porous cup solution extract, container effluent and placing the electrode directly in media, respectively. Continued coring for saturated paste determinations reduced fern growth by 38% during the period of study.