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- Title
Soil aggregate and particulate C and N under corn rotations: responses to management and correlations with yield.
- Authors
Cates, Anna; Ruark, Matthew
- 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.
- Subjects
HUMUS analysis; SOIL structure; CORN yields; CARBON sequestration; CROPPING systems; AGRICULTURE &; the environment
- Publication
Plant & Soil, 2017, Vol 415, Issue 1/2, p521
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-016-3121-9