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Interaction of long-term nitrogen fertilizer application, crop rotation, and tillage system on soil carbon and nitrogen dynamics

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Abstract

Background and aims

Tillage system and crop rotation influences soil organic carbon (SOC) and total N (TN), but there remains considerable uncertainty in the response of C and N dynamics to fertilizer N inputs. A long-term (11-yr) experiment on a clay loam Orthic Humic Gleysol at Ridgetown, Ontario, Canada was used to evaluate the impact of fertilizer N applications (in-season zero N (−N) compared to (+N) 100 and 80 kg N ha-1 yr.-1 to corn (Zea mays L.) and wheat (Triticum aestivum L.), respectively) on soil attributes.

Methods

The cropping systems consisted of continuous corn (CC), corn-soybean (Glycine max L.) (C-S) and corn-soybean-wheat (C-S-W) rotations using conventional moldboard plough and no-till systems. Soil was collected from the 0–120 cm profile in 5, 10, and 20 cm increments and analyzed for SOC and TN.

Results

The effect and interaction of N fertilization on soil attributes was highly dependent on crop rotation and tillage system. The gain in SOC and TN contents due to +N fertilizer was greatest (up to 31 and 57 % relative to the -N control, respectively) in the 0–20 cm depth with the C-S-W rotation, and lowest under CC, which showed no N fertilizer effect. However, differences in SOC and TN were not confined to the surface 20 cm, as N fertilizer treatments significantly influenced the contents at 20–60 and 60–120 cm in certain rotation and tillage systems; C-S-W was the most responsive to N fertilizer-induced SOC and TN gains.

Conclusions

Using regression analysis, we found that higher SOC contents corresponded to lower variability in the 5-yr. mean corn yield, which suggests that the inclusion of winter wheat in a C-S rotation may have important implications for sustainable and resilient agroecosystems in humid, temperate climates.

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Abbreviations

CC:

continuous corn

C-S:

corn-soybean rotation

C-S-W:

corn-soybean-wheat rotation

-N:

zero N treatment

+N:

fertilizer treatment

SOC:

soil organic carbon

TN:

total N

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Acknowledgments

Authors acknowledge past and present researchers for establishing and maintaining the long-term trial at the University of Guelph Ridgetown Campus, especially Doug Young, and Scott Jay, as well as Dr. R. P. Beyaert for SOC and TN analysis. We thank the following funding sources: Grain Farmers of Ontario, Ontario Ministry of Agriculture, Food and Rural Affairs, Agricultural Adaptation Council, and Agriculture and Agri-Food Canada’s Greenhouse Gas Mitigation Program.

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Correspondence to L. L. Van Eerd.

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Responsible Editor: Zucong Cai.

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Congreves, K.A., Hooker, D.C., Hayes, A. et al. Interaction of long-term nitrogen fertilizer application, crop rotation, and tillage system on soil carbon and nitrogen dynamics. Plant Soil 410, 113–127 (2017). https://doi.org/10.1007/s11104-016-2986-y

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