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Can Application of Dairy Liquid Manure over 10 Years into No-Tillage Affect Soil Phosphorus Lability?

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Abstract

Long-term application of dairy liquid manure (DLM) can modify soil phosphorus (P) dynamics. P fractionation allows the identification of organic and inorganic P and its lability via procedures of lesser and greater power extraction. The aim was to evaluate the effect of successive DLM applications (10 years) in no-tillage on soil P fractions. The experiment was carried out in an Oxisol with a sandy clay loam texture. Treatments consisted of three DLM doses (60, 120, and 180 m3 ha−1 year−1) and the control (unmanured) (0 m3 ha−1 year−1) randomized in a complete block design with four replicates. The soil was sampled at three depths (0–0.05; 0.05–0.10, and 0.10–0.15 m), and sequential extractions were performed for each depth. DLM increased soil P concentrations in all fractions, mainly in the 0–0.05 m depth resulting in the following proportions of P (average of all DLM doses in 0–0.05 m depth): labile (29%), moderately labile (38%), low lability (17%), and residual (16%). In the unmanured treatment, the proportion was labile (18%), moderately labile (39%), low lability (22%), and residual (21%). DLM application resulted in a higher proportion of organic and inorganic labile P (water, resin, and NaHCO3) indicating a greater plant availability but also a P water pollution risk by surface runoff.

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Acknowledgements

The authors are grateful to the National Council for Scientific and Technological Development (CNPq/Brazil), Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil), Foundation to Support the Scientific and Technological Development of Paraná State (Araucaria Foundation/Parana/Brazil) for the financial support (grants and scholarships), to Foundation for Agricultural Assistance and Technical Divulgation (ABC Foundation) for the field support.

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Correspondence to Nerilde Favaretto.

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Celante, L.S., Favaretto, N., Melo, V.F. et al. Can Application of Dairy Liquid Manure over 10 Years into No-Tillage Affect Soil Phosphorus Lability?. Water Air Soil Pollut 234, 453 (2023). https://doi.org/10.1007/s11270-023-06485-4

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  • DOI: https://doi.org/10.1007/s11270-023-06485-4

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