Soil chemical and fertilizer influences on soluble and medium-sized colloidal phosphorus in agricultural soils

Fresne, Maelle; Jordan, Phil; Fenton, Owen; Mellander, Per‐Erik; Daly, Karen

doi:10.1016/j.scitotenv.2020.142112

Cited by 40 publications

(16 citation statements)

References 49 publications

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“…In addition to this long-term monitoring instrumentation, mini lysimeters (Dupas et al, 2015) were installed in triplicate at DS and MS sites on the TG and TA transects to capture free soil solution in the USZ at a depth of 40 cm (Appendix Figure A). This was to determine baseline soil water P concentrations potentially influenced by site static characteristics (soil, subsoil), in relation to previous findings by Fresne et al (2021) on the influence of soil chemistry on medium-sized colloidal P.…”

Section: Experimental Set-upmentioning

confidence: 96%

“…The experiment considered P species either side of this threshold with the intention to isolate the medium-sized colloidal P species more particularly between 450 nm and 200 nm in a first campaign. Previous batch scale work had suggested this medium-sized colloidal P fraction had a role in P mobilised from Irish soils but with the extent determined by soil chemical properties and fertilizer type (Fresne et al, 2021). As a follow on from this work, the objectives in this study were to examine the role of colloidal P and other P fractions delivered to surface water via below-ground pathways in catchment hillslopes to streams: 1) with contrasting dominating soil chemistry and land use; 2) during contrasting (duration, total rainfall, seasonality) rainfall events.…”

Section: Introductionmentioning

confidence: 98%

“…A better understanding of how landscape properties control the spatio-temporal occurrence and intensity of colloidal P delivery is also required to better evaluate and quantify processes controlling P transfers in catchments and subsequently better target mitigation measures to minimise P losses. In particular, the role of soil chemical and physical properties in controlling colloidal P sources, mobilisation and concentrations in soil solution is of concern (Henderson et al, 2012;Ilg et al, 2008;Jiang et al, 2013;Mohanty et al, 2015;Siemens et al, 2004;Fresne et al, 2021). Additionally, the process of colloidal P transfer through the soil profile and unsaturated zone (USZ) to GW is not widely assessed in the field.…”

Section: Introductionmentioning

confidence: 99%

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The role of colloids and other fractions in the below-ground delivery of phosphorus from agricultural hillslopes to streams

Fresne

Jordan

Daly

et al. 2022

CATENA

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Colloids can be important for facilitated transfer of phosphorus (P) to groundwater (GW) and contribute to elevated P concentrations later delivered to surface water. To assess the role of colloidal P and other P fractions in delivery processes via below-ground pathways, this study investigated the influence of catchment and flow event characteristics on particulate (>450 nm), medium-sized colloidal (200-450 nm) and fine (<200 nm) P fractions in two agricultural hillslopes (TG, TA). Total and dissolved P fractions and their derivatives were also monitored. Samples in both stream and GW were taken weekly during baseflow conditions and every 2 h during storm conditions. Higher frequency monitoring of streamflow was also conducted to delineate hydrological flowpaths and determine P loads and hysteresis processes. Results indicated that during baseflow fine P was dominant in the streams (80 to 100 % of total P) and in shallow GW in TA (83 to 96 %) whereas in TG shallow GW was dominated by PP (55 to 96 %) possibly due to colloidal Fe-P complexes. Similarly, in TG shallow GW was dominated by PP (79 to 81 %) during high flow events. During a larger flow event (within the period of land fertilization) the quickflow pathway (24 % of total flow) delivered 3.2 g ha − 1 of PP which was dominant in the stream (44 to 68 %). A smaller flow event (within the period of prohibited land fertilization) facilitated delivery of P via deeper baseflow pathways (87 % of total flow) as fine reactive P (1.3 g ha − 1 ), also dominant in the stream (73 to 78 %). The research indicated a very limited presence of medium-sized colloidal P but a large presence of fine P that may contribute to elevating P concentrations above environmental thresholds. Further work should constrain the controlling factors for colloidal P presence/absence and also on the extent and speciation of coarser and finer fractions in the hillslope to stream continuum.

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Section: Experimental Set-upmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The role of colloids and other fractions in the below-ground delivery of phosphorus from agricultural hillslopes to streams

Fresne

Jordan

Daly

et al. 2022

CATENA

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“…Phosphorus (P) is an important nutrient for plant growth (Meyer et al 2020) and world food production (Fresne et al, 2021), playing a major role in plant metabolic processes (He et al 2020). Since the 1960s, the extensive use of P-fertilizers (Lin et al 2019), and many other P products has caused excessive P levels to more frequently disturb water bodies and aquatic systems (Lei et al 2020) and cause many environmental problems such as eutrophication (Liu et al 2017a) and also threat to human health (Xu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Phytate exudation by the roots of Pteris vittata can dissolve colloidal FePO4

Khan

Milham

Eltohamy

et al. 2021

Environ Sci Pollut Res

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Phosphorus (P) is limiting nutrient in soil system. The P availability in soil strongly depend on Iron (Fe) speciation. Colloidal iron phosphate (FePO 4coll ) is an important phosphorus (P) fraction in soil solution that carry P from soil to water bodies. This study tested the hypothesis that phytate exudation by Pteris vittata (P. vittata) can dissolve FePO 4coll that leads to release of P and Fe. The phytate exudation in P. vittata increased from 434−2136 mg kg −1 as the FePO 4coll concentration increased from 0−300 mM. The total P in P. vittata tissue increased from 2.88 to 8.28 g kg −1 , the trichloroacetic acid P fractions (TCA fractions) were: inorganic P (0.86-5.10 mg g −1 ), soluble organic P (0.25-0.87 mg g −1 ), and insoluble organic P (0.16-2.03 mg g −1 ) which leads to higher biomass as FePO 4coll increased from 0−300 mM.The linear regression analysis showed that FePO 4 solubilizing activity has a positive correlation with TP, TCA P fractions in P. vittata, TP in growth media, and root exudates. This study shows that phytate exudation dissolved the FePO 4coll due to the chelation effect of phytic acid on Fe, and due to the high Fe-P solubilizing activity in root exudates of P. vittata.

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“…Nitrogen (N) is a constituent element of proteins, nucleic acids (DNA and RNA), and chlorophyll in chloroplasts and other compounds in plants, which plays a significant role in plant growth and development [27,28]. Phosphorus (P) is a constituent element of many compounds in plants, such as nucleic acids (DNA and RNA), proteins, and enzymes, which promote plant growth and enhances the cold and drought resistance of crops [29]. Potassium (K) can promote photosynthesis so that cellular osmotic pressure can use water uptake and enhance the plant's ability to tolerate various adverse conditions [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Towards Precision Fertilization: Multi-Strategy Grey Wolf Optimizer Based Model Evaluation and Yield Estimation

et al. 2021

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Precision fertilization is a major constraint in consistently balancing the contradiction between land resources, ecological environment, and population increase. Even more, it is a popular technology used to maintain sustainable development. Nitrogen (N), phosphorus (P), and potassium (K) are the main sources of nutrient income on farmland. The traditional fertilizer effect function cannot meet the conditional agrochemical theory’s conditional extremes because the soil is influenced by various factors and statistical errors in harvest and yield. In order to find more accurate scientific ratios, it has been proposed a multi-strategy-based grey wolf optimization algorithm (SLEGWO) to solve the fertilizer effect function in this paper, using the “3414” experimental field design scheme, taking the experimental field in Nongan County, Jilin Province as the experimental site to obtain experimental data, and using the residuals of the ternary fertilizer effect function of Nitrogen, phosphorus, and potassium as the target function. The experimental results showed that the SLEGWO algorithm could improve the fitting degree of the fertilizer effect equation and then reasonably predict the accurate fertilizer application ratio and improve the yield. It is a more accurate precision fertilization modeling method. It provides a new means to solve the problem of precision fertilizer and soil testing and fertilization.

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Soil chemical and fertilizer influences on soluble and medium-sized colloidal phosphorus in agricultural soils

Cited by 40 publications

References 49 publications

The role of colloids and other fractions in the below-ground delivery of phosphorus from agricultural hillslopes to streams

The role of colloids and other fractions in the below-ground delivery of phosphorus from agricultural hillslopes to streams

Phytate exudation by the roots of Pteris vittata can dissolve colloidal FePO4

Towards Precision Fertilization: Multi-Strategy Grey Wolf Optimizer Based Model Evaluation and Yield Estimation

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