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Research ArticleResearch Section

Assessing manure and inorganic nitrogen fertilization impacts on soil health, crop productivity, and crop quality in a continuous maize agroecosystem

G.L. Miner, J.A. Delgado, J.A. Ippolito, C.E. Stewart, D.K. Manter, S.J. Del Grosso, B.A. Floyd and R.E. D'Adamo
Journal of Soil and Water Conservation July 2020, 75 (4) 481-498; DOI: https://doi.org/10.2489/jswc.2020.00148
G.L. Miner
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J.A. Delgado
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J.A. Ippolito
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C.E. Stewart
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D.K. Manter
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S.J. Del Grosso
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B.A. Floyd
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R.E. D'Adamo
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Abstract

Sustainable agricultural production requires an inclusive framework that concurrently considers the impacts of production methods on soil health, crop productivity, and crop nutritional quality. However, few studies have directly examined the potential associations among management impacts on soil health (SH), crop productivity, and crop quality. We evaluated these linkages in a continuous maize experiment with treatments varying in nitrogen (N) fertilizer amount and type (zero input control, inorganic N, and manure-based N treatment). We evaluated select SH indicators after six cropping years, and computed physical, chemical, biological, nutrient, and overall SH indices using the Soil Management Assessment Framework (SMAF). Crop yields, mineral nutrient concentrations (denoted with brackets), and nutrient uptake were analyzed in years six and seven. Manure application increased biological SH indicators compared to the control and inorganic N treatments and also increased available potassium (K), zinc (Zn), copper (Cu), and phosphorus (P). Overall SH indices were higher in the inorganic N and manure treatments than in the control but did not differ between the two N sources, despite the large exogenous sources of C, N, and nutrients applied via manure. The SMAF tool only directly considers P and K in terms of soil nutrients—other nutrient benefits of manure application (i.e., increases in total soil N, available Cu and Zn) were not accounted for, suggesting that the SMAF nutrient SH index should be modified to account for the impacts of management practices on nutrient availability. Crop yields were higher in treatments with higher overall SH, supporting the linkages between SH and crop productivity. Despite widely differing nutrient inputs and soil fertility levels, we found no yield differences between the two N sources. However, there were notable treatment impacts on crop quality. Grain [N] was 40% greater in the urea and manure treatments than in the control. Grain [P], [K], and [Mg], important elements in livestock nutrition, were 10% to 28% greater in the manure treatment than in the urea treatment. In addition, although a yield dilution of grain [Zn] occurred in the urea treatment, the dilution effect was mitigated in the manure treatment, likely due to increases in available Zn. Overarchingly, our results suggest that management practices that maintain or improve SH and nutrient availability also improve maize productivity and nutritional quality, which could have cascading positive impacts on animal and human nutrition.

    Key words
  • crop quality
  • maize
  • manure
  • nitrogen
  • productivity
  • soil health
  • © 2020 by the Soil and Water Conservation Society
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Journal of Soil and Water Conservation: 75 (4)
Journal of Soil and Water Conservation
Vol. 75, Issue 4
July/August 2020
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Assessing manure and inorganic nitrogen fertilization impacts on soil health, crop productivity, and crop quality in a continuous maize agroecosystem
G.L. Miner, J.A. Delgado, J.A. Ippolito, C.E. Stewart, D.K. Manter, S.J. Del Grosso, B.A. Floyd, R.E. D'Adamo
Journal of Soil and Water Conservation Jul 2020, 75 (4) 481-498; DOI: 10.2489/jswc.2020.00148

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Assessing manure and inorganic nitrogen fertilization impacts on soil health, crop productivity, and crop quality in a continuous maize agroecosystem
G.L. Miner, J.A. Delgado, J.A. Ippolito, C.E. Stewart, D.K. Manter, S.J. Del Grosso, B.A. Floyd, R.E. D'Adamo
Journal of Soil and Water Conservation Jul 2020, 75 (4) 481-498; DOI: 10.2489/jswc.2020.00148
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Keywords

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  • productivity
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