Abstract
Removing plant residue from soil has been shown to have an adverse effect on soil health; however, the addition of cover crops may help mitigate these impacts. This study was conducted to assess the effect of incorporating cover crops on soil health with varying removal rates of corn (Zea mays L.) residues. Corn was grown in rotation with soybean (Glycine max) in a randomized, split-block design with three different corn residue removal levels (37, 55, and 98% of total above-ground C) as whole plot treatments and the presence or absence of cover crops as the split plot treatment. Soil samples were collected from both crop phases following 7 years of cover crop treatment and subjected to a suite of soil health measurements. In the soybean phase immediately following corn residue removal, there were significant (P = 0.025) increases in the erodible fraction (EF) of soil aggregates and reductions in the stable, larger aggregate fractions. Cover crops mitigated these changes in aggregate distributions in the highest residue removal treatment. Residue removal resulted in a significant decrease in fPOM (P = 0.03) while the addition of cover crops increased fPOM levels during the soybean phase (P = 0.002). Residue removal significantly (P = 0.017) decreased soil microbial enzyme activities while cover crops restored activities in the highest residue removal treatment (P = 0.037). We also found higher fungal:bacterial ratios with cover cropping compared to no cover crops. We conclude that cover cropping continued over multiple years can partially mitigate negative effects of crop residue removal on soil health thus limiting soil erosion and maintaining nutrient cycling activities in the vulnerable period following residue removal.
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Abbreviations
- LRR:
-
Low residue removal
- MRR:
-
Medium residue removal
- HRR:
-
High residue removal
- EF:
-
Erodible fraction
- SOM:
-
Soil organic matter
- POM:
-
Particulate organic matter
- tPOM:
-
Total particulate organic matter
- cPOM:
-
Coarse particulate organic matter
- fPOM:
-
Fine particulate organic matter
- FDA:
-
Fluorescein diacetate
- DASD:
-
Dry aggregate size distribution
- MWD:
-
Mean weight diameter
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Wegner, B.R., Osborne, S.L., Lehman, R.M. et al. Seven-Year Impact of Cover Crops on Soil Health When Corn Residue Is Removed. Bioenerg. Res. 11, 239–248 (2018). https://doi.org/10.1007/s12155-017-9891-y
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DOI: https://doi.org/10.1007/s12155-017-9891-y