Phosphorus Fluxes in the Baltic Sea Region

Schick, Judith; Kratz, Sylvia; Bloem, Elke; Schnug, Ewald

doi:10.1007/978-3-030-39701-2_6

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…This can make the interpretation rather difficult and not easy to compare across trials. Several studies have criticized these classical techniques' apparent limitations, thereby reducing their trust and credibility ( Steffens et al, 2010; Schick et al, 2013; Cooper et al, 2018; Gu and Margenot , 2021; Barrow et al, 2021). Thus, many published reports might be underestimated, and their recommendations might be questioned or completely rejected.…”

Section: Are Current Analytical Methodologies Able To Promote Porgresearch?mentioning

confidence: 99%

Utilization of soil organic phosphorus as a strategic approach for sustainable agriculture

Sulieman

Mühling

2021

J. Plant Nutr. Soil Sci.

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Take home message Soil organic phosphorus (Porg) can significantly assist in minimizing the adverse effects of chemical phosphorus fertilizers on aquatic and marine resources. Success to achieve the desired lasting transformation is primarily reliant on the drastic reduction of wasteful applications of chemical phosphorus fertilizers, thereby paving the way for proper investment of soil Porg reserves. To this end, organically‐bound phosphorus can be viewed as a cornerstone for the future development of agriculture. Thus, we consider it very timely to emphasize the suitability of soil Porg to lead the way.

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Section: Are Current Analytical Methodologies Able To Promote Porgresearch?mentioning

confidence: 99%

Utilization of soil organic phosphorus as a strategic approach for sustainable agriculture

Sulieman

Mühling

2021

J. Plant Nutr. Soil Sci.

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“…When looking at the linear correlations of extracted soil P with P DGT , it is apparent that to some extent, all methods access a similar soil P pool commonly known as plant-available P [18,54]. Thus, the increase in labile P after fertilization, especially after the addition of mineral fertilizer, which was in agreement with other studies [7,22,32], was not only reflected in sequentially extracted P pools, but also in P CAL , P DL , and P DGT (Additional file 1: Table S5; Fig.…”

Section: Relation Of P Dgt To Other Soil P Tests and Consequences For...mentioning

confidence: 99%

Subsoils—a sink for excess fertilizer P but a minor contribution to P plant nutrition: evidence from long-term fertilization trials

Siebers¹,

Wang²,

Funk³

et al. 2021

Environ Sci Eur

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Background The phosphorus (P) stocks of arable subsoils not only influence crop production but also fertilizer P sequestration. However, the extent of this influence is largely unknown. This study aimed to (i) determine the extent of P sequestration with soil depth, (ii) analyze P speciation after long-term P fertilization, and (iii) compare soil P tests in predicting crop yields. We analyzed four long-term fertilizer trials in Germany to a depth of 90 cm. Treatments received either mineral or organic P, or a combination of both, for 16 to 113 years. We determined inorganic and organic P pools using sequential extraction, and P speciation using 31P nuclear magnetic resonance (NMR) and X-ray absorption near edge structure (XANES) spectroscopy. In addition, we applied three P soil tests, double-lactate (DL), calcium acetate lactate (CAL), and diffusive gradients in thin films (DGT). Results The results suggested that plants are capable of mobilizing P from deeper soil layers when there is a negative P budget of the topsoil. However, fertilization mostly only showed insignificant effects on P pools, which were most pronounced in the topsoil, with a 1.6- to 4.4-fold increase in labile inorganic P (Pi; resin-P, NaHCO3–Pi) after mineral fertilization and a 0- to 1.9-fold increase of organic P (Po; NaHCO3–Po, NaOH–Po) after organic P fertilization. The differences in Po and Pi speciation were mainly controlled by site-specific factors, e.g., soil properties or soil management practice rather than by fertilization. When modeling crop yield response using the Mitscherlich equation, we obtained the highest R2 (R2 = 0.61, P < 0.001) among the soil P tests when using topsoil PDGT. However, the fit became less pronounced when incorporating the subsoil. Conclusion We conclude that if the soil has a good P supply, the majority of P taken up by plants originates from the topsoil and that the DGT method is a mechanistic surrogate of P plant uptake. Thus, DGT is a basis for optimization of P fertilizer recommendation to add as much P fertilizer as required to sustain crop yields but as low as necessary to prevent harmful P leaching of excess fertilizer P.

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“…Nitric acid extracts a portion of calcium phosphates, and its acid components aid in the extraction of basic and micronutrients cations [18,23]. Ethylenediaminetetraacetic acid (EDTA) and ammonium nitrate form complexes with copper, zinc, iron, and manganese to release phosphate from heavy metal phosphates [25,26]. EDTA is also accountable for preventing precipitation of calcium fluoride [18,23].…”

Section: Introductionmentioning

confidence: 99%

A Novel Paper-Based Reagentless Dual Functional Soil Test to Instantly Detect Phosphate Infield

Zeitoun

Adamchuk

Biswas

2022

Sensors

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Soil tests for plant-available phosphorus (P) are suggested to provide offsite P analysis required to monitor P fertilizer application and reduce P losses to downstream water. However, procedural and cost limitations of current soil phosphate tests have restricted their widespread use and have made them accessible only in laboratories. This study proposes a novel paper-based reagentless electrochemical soil phosphate sensor to extract and detect soil phosphate using an inexpensive and simple approach. In this test, concentrated Mehlich-3 and molybdate ions were impregnated in filter paper, which served as the phosphate extraction and reaction zone, and was followed by electrochemical detection using cyclic voltammetry signals. Soil samples from 22 sampling sites were used to validate this method against inductively coupled plasma optical emission spectroscopy (ICP) soil phosphate tests. Regression and correlation analyses showed a significant relationship between phosphate determinations by ICP and the proposed method, delivering a correlation coefficient, r, of 0.98 and a correlation slope of 1.02. The proposed approach provided a fast, portable, low-cost, accessible, reliable, and single-step test to extract and detect phosphate simultaneously with minimum waste (0.5 mL per sample), which made phosphate characterization possible in the field.

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Phosphorus Fluxes in the Baltic Sea Region

Cited by 3 publications

References 14 publications

Utilization of soil organic phosphorus as a strategic approach for sustainable agriculture

Utilization of soil organic phosphorus as a strategic approach for sustainable agriculture

Subsoils—a sink for excess fertilizer P but a minor contribution to P plant nutrition: evidence from long-term fertilization trials

A Novel Paper-Based Reagentless Dual Functional Soil Test to Instantly Detect Phosphate Infield

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