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Open research questions in Phosphorus and nutrient management

92 unresolved questions extracted from the limitations and future-work sections of 597 Phosphorus and nutrient management papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The paper identifies the need for cost-effective and sustainable remediation strategies for heavy metal contamination. There is a gap in the development of efficient methods for immobilizing Cd and Pb in water and soil systems. The study aims to address this gap by exploring the use of ammonium oxalate modified phosphate tailings.

    Ammonium Oxalate Modified Phosphate Tailings for Cd and Pb Immobilization in Water and Soil: Performance, Mechanisms, and pH-dependent Applicability · 2026 · DOI

  • Technical challenges such as the difficulty in recovering phosphorus from waste streams and the need for region-specific strategies. Economic challenges such as the high cost of recovery technologies and the need for regulation and policy support. Environmental challenges such as the impact of phosphorus use on water quality and the need for sustainable management practices.

    Phosphorus Stewardship Across Food and Water Systems: Supply Risk, Legacy Phosphorus, and Recovery · 2026 · DOI

  • The lack of understanding of the connections between phosphorus supply vulnerability, agricultural surpluses and deficits, legacy soil phosphorus, eutrophication, and recovery technologies. The need for region-specific strategies to reduce phosphorus losses and improve access and efficiency. The uncertainty in accessing legacy phosphorus and the effectiveness of recovery technologies.

    Phosphorus Stewardship Across Food and Water Systems: Supply Risk, Legacy Phosphorus, and Recovery · 2026 · DOI

  • Further research on integrating soil P dynamics, crop P efficiency, and fertilizer innovation - Investigating the effects of soil hydrological conditions on phosphorus availability

    Phosphorus Fertilizer Technologies for Sustainable Phosphorus Management: From Soil Dynamics to Emerging Innovations · 2026 · DOI

  • The paper identifies a gap in the development of sustainable phosphorus management strategies. It highlights the need for innovative fertilizer technologies that can improve phosphorus use efficiency and reduce environmental impacts. The review notes that no single technology is universally superior, and that their effectiveness depends on soil conditions, crop requirements, and specific management objectives.

    Phosphorus Fertilizer Technologies for Sustainable Phosphorus Management: From Soil Dynamics to Emerging Innovations · 2026 · DOI

  • The lack of efficient and eco-friendly alternatives to traditional fertilizers, - the need for further optimization in biochar-based fertilizer formulations, - and the requirement for long-term field trials to validate their performance.

    Biochar-Based Fertilizers: Advancements, Applications, and Future Directions in Sustainable Agriculture—A Review · 2025 · DOI

  • The company lacked a track mechanism for certain shared flows among the three systems, - The absence of data made it challenging to precisely ascertain the exact amounts of these inputs and outputs of the TBA system, - Allocation was used for certain flows due to the lack of specific data

    Life Cycle Assessment of a Vegetable Tannin-Based Agent Production for Waters Treatment · 2024 · DOI

  • Investigating the long-term effects of P fertilizer application on soil P availability and crop P uptake. Examining the effects of different P sources on soil P fractions and P bioavailability. Studying the potential environmental problems associated with excessive P fertilizer application.

    The Synergistic Effects of Different Phosphorus Sources: Ferralsols Promoted Soil Phosphorus Transformation and Accumulation · 2024 · DOI

  • The use of recovered products as fertilizers may have unknown effects on rhizosphere microbiota and N2O emissions. The current crisis limits the production of fertilizers. The study requires a deep understanding of the influence of fertilization on N2O emissions and rhizosphere microbiota.

    Effect of Fertigation with Struvite and Ammonium Nitrate on Substrate Microbiota and N2O Emissions in a Tomato Crop on Soilless Culture System · 2024 · DOI

  • Limited knowledge is available regarding biochar obtained from beach-cast seaweed. The study only considered two temperatures and two residence times. The study did not investigate the long-term effects of biochar addition on soil properties.

    Characterization of Biochar from Beach-Cast Seaweed and Its Use for Amelioration of Acid Soils · 2024 · DOI

  • Investigating the long-term effects of biochar addition on soil properties. Exploring the potential applications of beach-cast seaweed biochars in other fields. Studying the effects of different pyrolysis temperatures and residence times on biochar properties.

    Characterization of Biochar from Beach-Cast Seaweed and Its Use for Amelioration of Acid Soils · 2024 · DOI

  • Production costs, - Variability in efficacy across different soil types, - The need for further optimization in formulation and application

    Biochar-Based Fertilizers: Advancements, Applications, and Future Directions in Sustainable Agriculture—A Review · 2025 · DOI

  • Achieving sustainable management of the nitrogen–phosphorus (N–P) cycling system is essential for advancing multiple United Nations Sustainable Development Goals, yet its long-term sustainability under carbon neutrality transition pathways remains insufficiently understood.

    Sustainability assessment of China's nitrogen-phosphorus cycling system under future carbon neutrality transition scenarios · 2026 · DOI

  • , vivianites (Fe 3 (PO 4 ) 2 ·8H 2 O) and Fe(III)-rich phosphorus (P) adsorbent materials, as phosphorus fertilizer is limited by the strong interaction between Fe and P.

    Recycled Iron Phosphates: A New Phosphorus Fertilizer for Paddy Rice · 2024 · DOI

  • Wet-chemically recovering phosphorus (P) from sewage sludge incineration ash (SSIA) has already become a global initiative to address P deficit, but effectively isolating P from these accompanying metals (AMs) through adsorption in a SSIA-derived extract remains elusive.

    Hydrothermally Stimulated Molecular Interfaces for Augmented Electron Delocalization in Wet-Chemical Phosphorus Recovery from Incineration Ash of Sewage Sludge · 2024 · DOI

  • The adsorption of phosphorus by pineapple leaf biochar (PB) prepared at different pyrolysis temperatures and its mechanism remain unclear.

    Structural Characteristics and Adsorption of Phosphorus by Pineapple Leaf Biochar at Different Pyrolysis Temperatures · 2024 · DOI

  • However, the P accumulation and transformation of different P sources in low-phosphorus red soil remain unclear.

    The Synergistic Effects of Different Phosphorus Sources: Ferralsols Promoted Soil Phosphorus Transformation and Accumulation · 2024 · DOI

  • However, their impact on the rhizosphere microbiota and N2O emissions is scarcely known.

    Effect of Fertigation with Struvite and Ammonium Nitrate on Substrate Microbiota and N2O Emissions in a Tomato Crop on Soilless Culture System · 2024 · DOI

  • Little is known about the effect of the long-term application of organic and inorganic fertilizers on P-use efficiency, P budget, and the residual effect of P fertilizer.

    The Crop Phosphorus Uptake, Use Efficiency, and Budget under Long-Term Manure and Fertilizer Application in a Rice–Wheat Planting System · 2024 · DOI

  • However, traditional experiment-basis optimization of struvite crystallization conditions is time-consuming, labor-intensive, and limited to the number of variables.

    Machine-learning-aided prediction and optimization of struvite recovery from synthetic wastewater · 2024 · DOI

  • This research aims to fill a gap in the understanding of selective calcium removal prior to struvite precipitation to increase its purity.

    An innovative two-step methodology for struvite recovery from wastewater with high purity and agronomic potential · 2024 · DOI

  • There is a need for more effective and sustainable phosphate adsorption methods. The use of serpentinite as an adsorbent has been explored, but its performance can be improved through modification.

    Realistic and sustainable phosphate adsorption using intercalant-engineered exfoliated serpentinite: mechanistic insights and real-water validation · 2026 · DOI

  • Need for evaluation of KC/SP performance under simultaneous presence of multiple heavy metal cations (Pb2+, Cu2+, Cd2+, and Zn2+) in realistic multicomponent wastewater systems to determine operational robustness.

    Realistic and sustainable phosphate adsorption using intercalant-engineered exfoliated serpentinite: mechanistic insights and real-water validation · 2026 · DOI

  • The quantification of vivianite in wastewater samples is challenging due to the presence of other iron-containing phases. Traditional methods for phosphorus recovery have limitations, such as interference from iron.

    Multi-Method analysis including 57Fe Mössbauer Spectroscopy to quantify vivianite for phosphorus recovery in real wastewater environments · 2026 · DOI

  • The study notes that agricultural runoff is a complex issue, with multiple sources and pathways of contamination. The research highlights the challenge of developing effective and cost-efficient treatment solutions for agricultural drainage water. The study acknowledges the need to balance the removal of contaminants with the potential for environmental harm or unintended consequences.

    Agricultural Drainage Water Treatment with Metal-Coated Recycled Glass as Filtration Media · 2026 · DOI

Most-cited papers in Phosphorus and nutrient management

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92 open questions have been extracted from the limitations and future-work passages of 597 Phosphorus and nutrient management papers in our 4.5M-paper local library. Each one below links back to the study that raised it, so you can read the original claim in context.

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