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Effect of Different Proportions of Mineral Nitrogen Fertilizer Substitutions with Organic Manure on Soil Phosphorus Fractions Distribution in an Entisol Profile

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Abstract

The partial substitution of mineral nitrogen (N) fertilizer with organic manure can mitigate the negative effect of N on the environment. However, little is known about whether the introduction of additional phosphorus (P) with different proportions of organic manure application promotes P migration in soil profile, which is closely related to P non-point source pollution. Five field fertilization experiments mineral N, P, potassium (K) fertilizers only (NPK) and 30%, 50%, 70%, 100% of mineral fertilizer N substituted with organic manure (PM30, PM50, PM70, PM100), were conducted to evaluate the effect of different proportions of organic manure substitution for mineral N fertilizer on distribution of P fractions in soil profile. P mainly accumulated in the soil in the form of inorganic P, and the total P (TP) and total inorganic P (TIP) showed increasing trend with increasing soil depth under organic manure substitution treatments. Detailed P fractionation data showed that compared with NPK treatment, labile inorganic P fractions mainly accumulated in surface soil under organic manure substitution treatments, while stable inorganic P fractions migrated vertically. Moreover, the high proportion of organic manure substitution treatment had a higher labile and stable inorganic P contents in the surface soil and the deep soil relative to the low proportion of organic substitution, respectively. The high proportion of organic manure substitution treatment would lead to a higher risk of P loss by surface runoff and leaching. Therefore, when substituting mineral N fertilizer with organic manure, P should also be considered, and the substitution proportion of organic manure needed to be optimized from the perspective of reducing the risk of P loss.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2022YFD1901401) and the Youth Innovation Promotion Association, CAS (No. 2,021,374).

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Correspondence to Kai Wei.

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Yuan, C., Wei, K., Wang, J. et al. Effect of Different Proportions of Mineral Nitrogen Fertilizer Substitutions with Organic Manure on Soil Phosphorus Fractions Distribution in an Entisol Profile. J Soil Sci Plant Nutr (2024). https://doi.org/10.1007/s42729-024-01748-3

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  • DOI: https://doi.org/10.1007/s42729-024-01748-3

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