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Plant and Soil

, Volume 415, Issue 1–2, pp 521–533 | Cite as

Soil aggregate and particulate C and N under corn rotations: responses to management and correlations with yield

  • Anna M. Cates
  • Matthew D. Ruark
Regular Article

Abstract

Background

Soil aggregate and particulate organic matter (POM) C and N provide valuable insight into C cycling and storage, and are sensitive to management, but effect of these pools on corn yield is unknown.

Methods

Corn yield, N uptake, and aggregate and POM C and N at 0–5, 5–25 and 25–50 cm were measured and correlated in continuous corn (Zea mays L.) (CC), strip-till corn/soybean [Glycine max (L.) Merr.] (CS), and organically managed corn/soybean/wheat (Triticum aestivum L.) with green manure (CSW).

Results

The POM differed only at 0–5 cm, where greater POM mass was found in CS than CC and CSW. Lower POM-C and POM-N was found in CSW than CC and CS. Overall, CSW had fewer macroaggregates (>250 μm) and associated C and N than CC and CS, but free silt and clay (<53 μm) and microaggregates (53–250 μm) were enriched in C and N in CSW. Yield and macroaggregate-occluded C and N were negatively correlated. Yield and 5–25 cm free silt and clay C were positively correlated.

Conclusions

While organic matter in aggregate-occluded fractions is beneficial for soil C storage, it was correlated with lower grain yields, highlighting a potential tradeoff between yield and long-term C sequestration.

Keywords

Carbon storage Cropping systems Soil organic matter dynamics 

Abbreviations

SOC

Soil organic carbon

SOM

Soil organic matter

POM

Particulate organic matter

cPOM

Coarse particulate organic matter

AONR

Agronomic optimum nitrogen rate

Notes

Acknowledgements

Thanks to D.S. Duncan, A. von Haden, R.D. Jacskon, and K. Nicolakakis for helpful comments on the manuscript, to Dr. Lawrence G. Oates for C and N analysis, and to Dr. Gregg R. Sanford, Janet Hedtcke and the late Dr. J.L. Posner for maintaining the WICST trial and associated data. Generous internal support for the WICST trial was provided by the University of Wisconsin Arlington Agricultural Research Station. Funding was provided by USDA-NIFA Hatch Project 229696, the Wisconsin Fertilizer Research Council and USDA-NIFA-AFRI-004715.

Supplementary material

11104_2016_3121_MOESM1_ESM.pdf (289 kb)
Figure S1 Correlations between 2013 yield metrics and SOM fractions in the Wisconsin Integrated Cropping Systems Trial. For correlation statistics see Table 4.(PDF 289 kb)

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.Department of AgronomyMadisonUSA
  2. 2.Department of Soil ScienceUniversity of Wisconsin-MadisonMadisonUSA

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