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18 August 2020 Influence of feedlot manure amendments on dissolved organic carbon in runoff during transition from continuous to legacy applications
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Abstract

Little research has compared land application of stockpiled (SM) or composted (CM) beef feedlot manure with straw (ST) or wood-chip (WD) bedding on loss of dissolved organic carbon (DOC) in runoff. We conducted a 6 yr (2013–2018) rainfall simulation-runoff study and utilized surface (0–5 cm) soil collected from a long-term (since 1998) field experiment on a clay loam soil in southern Alberta, Canada. The treatments consisted of SM or CM with ST or WD bedding applied at 13, 39, and 77 Mg·ha−1 (dry weight), as well as an unamended control and mineral fertilizer treatment. Surface soil was collected from all treatments after 15–17 (C15, C16, and C17; 2013–2015) continual annual applications and then after one to three legacy years (L1–L3, 2016–2018) after manure applications were first discontinued in 2015. The soil was packed into runoff trays, and flow-weighted mean concentrations (FWMCs) and mass loads of DOC in runoff water were determined during rainfall simulations. Mean DOC losses were generally significantly (P ≤ 0.05) lower for CM with ST bedding compared with the other manure type – bedding treatments in certain years and were consistent with this amendment having the lowest total carbon (C) content. The total C content of the amendments explained 92% of the variation in DOC concentration. Termination of long-term manure applications reduced FWMCs by 85%–91% and mass loss by 76%–89% from the C17 to L3 year. Therefore, our findings suggested that composting manure with ST or discontinued long-term manure application may reduce DOC loss in runoff.

Copyright remains with author D.S. Chanasyk and with Her Majesty the Queen in Right of Canada, as represented by the Minister of Agriculture and Agri-Food Canada 2020. Permission for reuse (free in most cases) can be obtained from copyright.com.
J.J. Miller, B.W. Beasley, M.L. Owen, X. Hao, C.F. Drury, and D.S. Chanasyk "Influence of feedlot manure amendments on dissolved organic carbon in runoff during transition from continuous to legacy applications," Canadian Journal of Soil Science 100(4), 440-452, (18 August 2020). https://doi.org/10.1139/cjss-2019-0159
Received: 4 December 2019; Accepted: 5 August 2020; Published: 18 August 2020
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