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24 March 2016 Nongrowing season soil surface nitrate and phosphate dynamics in a corn—soybean rotation in eastern Canada: in situ evaluation using anionic exchange membranes
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Abstract

Determining how agricultural management practices affect changes in soil nitrogen (N) and phosphorus (P) could further our understanding of soil N and P cycle. The main objective of this study was to assess in situ nongrowing season soil nitrate and phosphate dynamics as adsorbed on anionic exchange membranes (AEM-N and AEM-P, respectively). The membranes were buried in the surface horizon (5 cm below the soil surface) over the nongrowing season (mid-November to mid-April) in five consecutive years (2009-2010 to 2013-2014) in a long-term corn-soybean rotation experiment established in 1992 in eastern Canada. The treatments consisted of two tillage systems, namely moldboard plow (MP) and no-till (NT), and nine combinations of fertilizer applications, namely three N rates (0, 80, and 160 kg N ha-1) and three P rates (0, 17.5, and 35 kg P ha-1) in a split-plot design with four replications. The results showed that AEM-N and AEM-P averaged 1.8 µg cm-2 d-1 and 7.4 ng cm-2 d-1 under MP, respectively, and 2.8 µg cm-2 d-1 and 67.8 ng cm-2 d-1 under NT, respectively. Nitrogen application increased AEM-N in 2010-2011, 2011-2012, and 2012-2013, but decreased AEM-P mainly under NT. Phosphorus fertilization had no effect on AEM-N, but increased AEM-P under both MP and NT. We conclude that AEM can be used as a technique to study N and P dynamics under cold winters of eastern Canada.

© Her Majesty the Queen in right of Canada 2016. Permission for reuse (free in most cases) can be obtained from RightsLink.
Yichao Shi, Noura Ziadi, Aimé J. Messiga, and Roger Lalande "Nongrowing season soil surface nitrate and phosphate dynamics in a corn—soybean rotation in eastern Canada: in situ evaluation using anionic exchange membranes," Canadian Journal of Soil Science 96(2), 136-144, (24 March 2016). https://doi.org/10.1139/cjss-2015-0016
Received: 9 February 2015; Accepted: 1 November 2015; Published: 24 March 2016
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