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Agriculture 2012, 2(1), 52-72; doi:10.3390/agriculture2010052

Sorption of Tannin and Related Phenolic Compounds and Effects on Extraction of Soluble-N in Soil Amended with Several Carbon Sources

1,* , 2
1 USDA-ARS, Appalachian Farming Systems Research Center, 1224 Airport Road, Beaver, WV 25813-9423, USA 2 USDA-ARS, Pendleton, OR 97810, USA 3 USDA-ARS, Pullman, WA 99164, USA 4 Miami University, Oxford, OH 45056, USA
* Author to whom correspondence should be addressed.
Received: 1 January 2012 / Revised: 18 February 2012 / Accepted: 21 February 2012 / Published: 27 February 2012
(This article belongs to the Special Issue Soil Biology and Its Importance in Soil Fertility)
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Some tannins sorb to soil and reduce soluble-N. However, we know little about how they interact with organic amendments in soil. Soil (0–5 cm) from plots, which were amended annually with various carbon substances, was treated with water (control) or solutions containing tannins or related phenolic subunits. Treatments included a proanthocyanidin, catechin, tannic acid, β-1,2,3,4,6-penta-O-galloyl-D-glucose (PGG), gallic acid, and methyl gallate. We applied solutions of each of these materials to soil and measured soluble-C and -N in supernatants after application and following extraction with hot water (16 h, 80 °C). Sorption was low for non-tannin phenolics, methyl gallate, gallic acid, and catechin, and unaffected by amendment. Sorption of tannins, proanthocyanidin, tannic acid, and PGG, was higher and greater in plots amended with biosolids or manure. Extraction of soluble-N was not affected by amendment or by catechin, proanthocyanidin, or methyl gallate, but was reduced with PGG, tannic acid and gallic acid. Soil cation exchange capacity increased following treatment with PGG but decreased with gallic acid, irrespective of amendment. Tannins entering soil may thus influence soil organic matter dynamics and nutrient cycling but their impact may be influenced by the composition of soil organic matter.
Keywords: tannins; C-sorption; soil organic matter; amendments; soluble-N; CEC tannins; C-sorption; soil organic matter; amendments; soluble-N; CEC
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Halvorson, J.J.; Gollany, H.T.; Kennedy, A.C.; Hagerman, A.E.; Gonzalez, J.M.; Wuest, S.B. Sorption of Tannin and Related Phenolic Compounds and Effects on Extraction of Soluble-N in Soil Amended with Several Carbon Sources. Agriculture 2012, 2, 52-72.

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