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Soil biochemical properties and crop productivity following application of locally produced biochar at organic farms on Waldron Island, WA

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Abstract

Biochar (a carbon-rich product from pyrolysis of organic materials) additions to agricultural soils have been shown to often result in neutral to positive influences on soil properties and processes; however, the only a limited number of studies have been conducted on active organic farming systems and of those, none have used multivariate analytical methods to examine the influence of biochar on soil microbial activity, nutrient cycling, and crop performance. In this study, biochar produced from local timber harvest residues on Waldron Island, WA was applied in factorial combination with a poultry litter based fertilizer to replicated plots on six organic farms that were all growing Kabocha squash (Cucurbita maxima) in the summer of 2016. A series of soil physicochemical and biochemical properties were examined after 5 months of biochar application; squash samples were evaluated for productivity and nutrient uptake. Factorial multivariate analysis of variance (MANOVA) revealed a significant influence of biochar on soil properties as well as a synergistic effect of biochar and poultry litter during a 5 month field trial. Principle component analysis (PCA) highlighted soil total C content, microbial biomass C, enzyme activities, bioavailable P, and phosphatase enzyme activity as the variables most influenced by biochar incorporation into surface mineral soil. Redundancy analysis (RDA) further indicated that better soil biochemical conditions, particularly soil enzyme activities and available P concentrations, were associated with higher crop productivity in biochar-treated plots. Overall, our study demonstrates that locally produced wood biochar, in addition to improving soil C storage, has the potential to significantly improve soil fertility and crop productivity in organic farming systems on sandy soils.

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Acknowledgements

The authors gratefully appreciate the financial support provided by the Amazon Catalyst program at the University of Washington. The authors would like to thank the owners of each of the farms for giving us access to their property and assisting us with establishment and maintenance of the field trials: Steve and Linnea Bensel, Ilsa and Sally Huntley, Rebecca Moore, Carla Jo, and Sarah Benson. Thanks also to Amanda Bidwell and Alvin Lieu for their help with field and laboratory work.

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Correspondence to Thomas H. DeLuca.

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Responsible Editor: Asmeret Asefaw Berhe.

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Gao, S., Hoffman-Krull, K. & DeLuca, T.H. Soil biochemical properties and crop productivity following application of locally produced biochar at organic farms on Waldron Island, WA. Biogeochemistry 136, 31–46 (2017). https://doi.org/10.1007/s10533-017-0379-9

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  • DOI: https://doi.org/10.1007/s10533-017-0379-9

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