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United States Department of Agriculture

Agricultural Research Service

Research Project: CONSERVATION SYSTEMS RESEARCH FOR IMPROVING ENVIRONMENTAL QUALITY AND PRODUCER PROFITABILITY

Location: National Soil Dynamics Laboratory

Title: Extending pine bark supplies with wholetree and clean chip residual substrates

Authors
item Murphy, A -
item Gilliam, Charles -
item Fain, Glenn -
item Torbert, Henry
item Gallagher, Thomas -
item Sibley, Jeff -
item Marble, Chris -
item Witcher, Anthony

Submitted to: Journal of Environmental Horticulture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 7, 2010
Publication Date: December 15, 2010
Citation: Murphy, A., Gilliam, C., Fain, G., Torbert III, H.A., Gallagher, T., Sibley, J., Marble, C., Witcher, A.L. 2010. Extending pine bark supplies with wholetree and clean chip residual substrates. Journal of Environmental Horticulture. 28:217-223.

Interpretive Summary: With the recent decline of available PB supplies, and the threat of continued decline, nursery growers have begun seeking possible alternatives or amendments for their standard growing media. WholeTree substrate (WT) and clean chip residual (CCR) are two possible substrate alternatives with commercialization possibilities. This data shows that with most species, nursery producers could amend their PB with up to 75% WT or 75% CCR with limited impact on crop growth. This information will allow growers to develop plans for extending existing PB supplies with WT or CCR.

Technical Abstract: Limited supplies of pine bark (PB) due to a number of reasons over the past several years has caused concern among many nursery producers. This study was developed to evaluate varying ratios of pine bark (PB) with clean chip residual (CCR) or WholeTree substrate (WT), in order to assist growers with extending existing PB supplies. This study demonstrated that woody ornamentals grown in varying ratios of PB:WT and PB:CCR had similar growth overall to plants grown in a current nursery standard of 100% pine bark (PB). This information will allow growers to develop plans for extending existing PB supplies with WT or CCR. This process will also allow nursery producers the opportunity to become comfortable with using these alternative substrates as amendments before switching completely to 100% alternative substrates.

Last Modified: 7/30/2014