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Recognizing the role of soil organic phosphorus in soil fertility and water quality

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  • Dodd, R.J.
  • Sharpley, A.N.

Abstract

Despite the large scale implementation of conservation schemes aimed at reducing phosphorus (P) loss from agricultural lands, significant improvements in water quality at the watershed scale remain elusive. Changes in land management influence the speciation and cycling of P within soils and recent promotion of conservation practices to improve soil health revolve around increasing soil carbon stores, thereby increasing the pool of soil organic P. Adopting conservation tillage, use of cover crops, strategic crop rotations, and use of manures can increase organic P by 3–180% and microbial biomass pool of P by 30–240%. The role of organic P in soil fertility has been largely ignored in current soil testing methods, which in many cases may explain the lack of crop response to recommended fertilizer inputs in a growing number of trials. Conversely, soil organic P is gaining recognition as a potential source of P to runoff. This review explores the impact of adopting widely promoted “soil health” conservation practices on the speciation and cycling of soil P, with particular focus on the organic pool and the biotic processes regulating its accumulation and mobilization. Large stores of organic P exist in arable and grassland soils and strategies that increase the plant availability of these P stores could reduce the reliance on external P inputs, creating more sustainable P use. However, more detailed, mechanistic knowledge of soil organic P cycling, especially through the microbial biomass, is required. Furthermore, caution is needed to ensure that increasing the availability of organic P does not increase P loss in runoff effectively turning P sinks into P sources.

Suggested Citation

  • Dodd, R.J. & Sharpley, A.N., 2015. "Recognizing the role of soil organic phosphorus in soil fertility and water quality," Resources, Conservation & Recycling, Elsevier, vol. 105(PB), pages 282-293.
    • Handle: RePEc:eee:recore:v:105:y:2015:i:pb:p:282-293
    DOI: 10.1016/j.resconrec.2015.10.001
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    References listed on IDEAS

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    1. Benjamin L. Turner & Philip M. Haygarth, 2001. "Phosphorus solubilization in rewetted soils," Nature, Nature, vol. 411(6835), pages 258-258, May.
    2. Lynch, Derek H., 2015. "Nutrient Cycling and Soil Health in Organic Cropping Systems - Importance of Management Strategies and Soil Resilience," Sustainable Agriculture Research, Canadian Center of Science and Education, vol. 4(3 Special).
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    Cited by:

    1. Ewa Szara & Tomasz Sosulski & Magdalena Szymańska, 2019. "Soil phosphorus sorption properties in different fertilization systems," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(2), pages 78-82.
    2. Scholz, Roland W. & Wellmer, Friedrich-Wilhelm, 2015. "Losses and use efficiencies along the phosphorus cycle – Part 2: Understanding the concept of efficiency," Resources, Conservation & Recycling, Elsevier, vol. 105(PB), pages 259-274.
    3. Ewa Szara & Jolanta Kwiatkowska-Malina & Grzegorz Malina, 2023. "Can Organic Matter from Waste-Derived Amendments Limit Phosphorus Losses from Soil to the Aquatic Environment?," Agriculture, MDPI, vol. 13(2), pages 1-16, February.

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