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N Fertilizer Reduction Combined with Organic Amendment Enhances Soil Multifunctionality by Altering Nutrient Availability and Fungal Community Structure in an Intensive Grain Production System

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Abstract

How soil ecosystem multifunctionality (EMF) and microbiome in the high-input agricultural system respond to reduced mineral N input (RMNI) and organic fertilization (OF) remains not completely clear. Increasing the knowledge involved will help explore suitable fertilization regime for sustainable land use in intensive production system. Using an intensively cultivated winter wheat and summer maize rotation field receiving long-term high N fertilization, we explored the effect of RMNI and OF on crop productivity and soil physicochemical properties, EMF, and bacterial and fungal communities. Six treatments were employed here: farmers’ N fertilization rate (FNR, as a control), OF and FNR + OF as well as three combinations of RMNI and OF (namely, 80%FNR + OF, 60%FNR + OF and 40%FNR + OF). All RMNI + OF treatments increased grain yield, lowered soil nitrate content, and increased total organic carbon and nitrogen and available phosphorus and potassium contents. However, only 80%FNR + OF increased soil easily oxidized organic carbon content. RMNI + OF treatments did not affect bacterial microbiome but changed fungal community structure, with the strongest impact by 80%FNR + OF. In addition, of all tested treatments, just 80%FNR + OF increased soil EMF and such an increase was attributed to the changes in soil available phosphorus and nitrate contents and fungal community structure. Moderately reducing N supply combined with organic fertilization (80%FNR + OF herein) enhanced crop productivity and improved soil functioning and quality. Soil physicochemical properties may play a more important role in regulating EMF than microbiome in the intensive grain production system.

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The data used to support the findings of this study are available from the corresponding author upon request. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgements

We greatly acknowledge financial support for this study from the Key Project in Scientific and Technological Development of Henan Province (grant number: 222102110016) and the National Natural Science Foundation of China (grant number: 41601250). The authors would like to thank the anonymous reviews for their helpful comments and suggestions.

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Correspondence to Xing Liu.

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Liu, X., Wang, F., Zhang, Y. et al. N Fertilizer Reduction Combined with Organic Amendment Enhances Soil Multifunctionality by Altering Nutrient Availability and Fungal Community Structure in an Intensive Grain Production System. J Soil Sci Plant Nutr (2024). https://doi.org/10.1007/s42729-024-01819-5

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  • DOI: https://doi.org/10.1007/s42729-024-01819-5

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