Influence of Bark, Dolomite, and Fertilizer Sources on Leachate pH of Nursery Medium

in HortScience
Authors:
Allen D. OwingsLSU Agricultural Center, P.O. Box 25100, Baton Rouge, LA 70894-5100

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Edward W. BushLSU Agricultural Center, P.O. Box 25100, Baton Rouge, LA 70894-5100

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Mitchell W. GoyneLSU Agricultural Center, P.O. Box 25100, Baton Rouge, LA 70894-5100

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Leachates were collected at 3-month intervals over 12 months to determine the influence of bark, controlled-release fertilizer, and dolomitic lime sources and dolomitic lime application rates on pH of nursery media. The randomized complete-block design was arranged as a factorial and included three bark sources (pinebark, hardwood, and pinebark + hardwood), two fertilizer sources (Nutricote 17-7-8 and SierraBlen 18-7-10), and two dolomitic lime sources (microencapsulated granular and pulverized). Dolomitic lime application rates were 0, 5, 10, and 15 pounds per cubic yard. Leachate pH was influenced over the one-year evaluation period by fertilizer source, bark source, and application rate of dolomitic lime. Dolomitic lime source was not a significant factor in adjustment of leachate pH. Pinebark medium had lower leachate pHs than hardwood medium and the medium containing hardwood and pinebark. Dolomitic lime influenced leachate pH of pinebark medium more than the other bark sources. SierraBlen was more acid-forming than Nutricote.

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