Long‐term Effects of Organic Waste Fertilizers on Soil Structure, Tracer Transport, and Leaching of Colloids

Lekfeldt, Jonas Duus Stevens; Kjærgaard, Charlotte; Magid, Jakob

doi:10.2134/jeq2016.11.0457

Cited by 19 publications

(19 citation statements)

References 46 publications

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“…However, soil aggregation mainly depends on the availability of active mineral surfaces and the dispersion/ flocculation behaviors of the colloidal components [21]. Meanwhile, the degree of clay colloid dispersion can be reduced by increasing the aggregate stability [18,22,23]. Therefore, the stability of soil aggregates directly affects the migration of soil colloids.…”

Section: Introductionmentioning

confidence: 99%

Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Jin

et al. 2020

Environ Sci Eur

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Background: Colloid-facilitated phosphorus (P) transport is recognized as an important pathway for the loss of soil P in agricultural systems; however, information regarding soil aggregate-associated colloidal P (P coll ) is lacking. To elucidate the effects of aggregate size on the potential loss of P coll in agricultural systems, soils (0-20 cm depth) from six land-use types were sampled in the Zhejiang Province in the Yangtze River Delta region, China. The aggregate size fractions (2-8 mm, 0.26-2 mm, 0.053-0.26 mm and < 0.053 mm) were separated using the wet sieving method. Colloidal P and other soil parameters in aggregates were analyzed. Results:Our study demonstrated that 0.26-2 mm small macroaggregates had the highest total P (TP) content. In acidic soils, the highest P coll content was observed in the 0.26-to 2-mm-sized aggregates, while the lowest was reported in the < 0.053 mm (silt + clay)-sized particles, the opposite of that revealed in alkaline and neutral soils. Paddy soils contained less P coll than other land-use types. The proportion of P coll in total dissolved P (TDP) was dominated by < 0.053 mm (silt + clay)-sized particles. Aggregate size strongly influenced the loss potential of P coll in paddy soils, where P coll contributed up to 83% TDP in the silt + clay-sized particles. The P coll content was positively correlated with TP, Al, Fe, and the mean weight diameter. Aggregate-associated total carbon (TC), total nitrogen (TN), C/P, and C/N had significant negative effects on the contribution of P coll to potential soil P loss. The P coll content of the aggregates was controlled by the aggregate-associated TP and Al content, as well as the soil pH value. The potential loss of P coll from aggregates was controlled by its organic matter content. Conclusion:We concluded that management practices that increase soil aggregate stability or its organic carbon content will limit P coll loss in agricultural systems.

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Section: Introductionmentioning

confidence: 99%

Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Jin

et al. 2020

Environ Sci Eur

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“…After the first flush, the particle concentrations started to increase again for several of the columns and did not stabilize at a constant low level (Glæsner et al, 2011a; Lekfeldt et al, 2017). The particle concentrations for Columns 21 and 33, for example, started to increase after 15‐ to 20‐mm outflow, whereas this phenomenon was less pronounced for Column 5 with a lower clay content.…”

Section: Resultsmentioning

confidence: 99%

“…5, and they all have low APM, R1, and R2 values. Although MF vol is the main factor controlling particle release and release rates, a high OC content exerts a stabilizing effect on the soil aggregates, reducing particle mobilization (Villholth, 1999; Lekfeldt et al, 2017). A high OC content was previously reported to reduce pore water velocity and preferential flow (Larsbo et al, 2016; Paradelo et al, 2016), and thus it reduces the hydrodynamic forces responsible for dragging particles from the soil pore walls.…”

Section: Resultsmentioning

confidence: 99%

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Particle Leaching Rates from a Loamy Soil Are Controlled by the Mineral Fines Content and the Degree of Preferential Flow

et al. 2018

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The mobilization and transport of colloid particles in soils can have negative agronomic and environmental effects. This work investigates the controls of particle release and transport from undisturbed soil columns sampled from an agricultural, loamy field with clay and silt contents of 0.05 to 0.14 and 0.07 to 0.16 kg kg−1, respectively. Forty‐five soil columns (20 × 20 cm) were collected from the field and exposed to a constant irrigation of 10 mm h−1 for 8 h. The accumulated mass of particles in the outflow from each column was highly correlated (r = 0.88) with the volumetric mass of fines (MFvol). The MFvol is defined as the sum of clay and fine silt (<20 μm) multiplied by the soil bulk density and divided by the particle density of the mineral fines. Thereby, MFvol represents both the particle source available for mobilization and leaching and an indicator of soil structure. The particle release process showed two linear particle release rates. Although the two particle release rates were distinctly different, both were strongly correlated with MFvol. The difference between the two rates was related to the degree of preferential flow characterized by the 5% arrival time of an applied tracer pulse. Soil columns with a longer 5% arrival time (less preferential flow) showed a distinct difference between the two rates, whereas soil columns with a short 5% arrival time and fast water transport showed resemblance between the two particle release rates. Thus, the combined effects of particle source, type, and pathways (via soil structure and compaction) need consideration to understand and predict particle transport dynamics through intact topsoil. Core Ideas Particle leaching from intact soil columns depends on both texture and structure. Volumetric content of mineral fines well predicts particle mobilization and transport. During preferential flow conditions, the particle leaching rate is relatively constant. Varying particle mobilization rates occur mainly during matrix‐dominated flow.

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“…Colloids either can bind to soil aggregates, or be physically strained from water flowing though pores between aggregates [13,14]. Soil organic carbon (SOC) promotes aggregate stability and thus reduces the degree of clay colloid dispersion [15][16][17]. Some scholars determined the colloid content in 1-2 mm aggregates in 39 soils, and found a significant positively correlation between water dispersible colloid (WDC) content and clay content in soil aggregates [15].…”

Section: Introductionmentioning

confidence: 99%

Increase soil aggregate stability can limit colloidal phosphorus loss potentials from agricultural systems

Jin

et al. 2019

Preprint

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Background Colloid-facilitated phosphorus (P) transport is a recognized important pathway for soil P loss in agricultural systems, but limited information is available on the soil aggregate-associated colloidal P. To elucidate the effects of aggregate size on the loss potential of colloidal P (P coll ) in agricultural systems, soils (0-20 cm depth) from six land use types were sampled in Zhejiang province in the Yangtz river delta region, China. The aggregate size fractions (2–8 mm, 0.26–2 mm, 0.053–0.26 mm and <0.053 mm) separated by wet-sieving method were analyzed.Results Results showed that the 0.26–2 mm small macroaggregates had the highest total P (TP) content. For acidic soils, the highest P coll content was also found in the 0.26–2 mm aggregate size, while the lowest was found in the <0.053 mm (silt+clay)-sized particles, the opposite of that found in alkaline soils. Paddy soils contained less P coll than other land use types. The P coll in total dissolved P (TDP) was dominated by <0.053 mm (silt+clay)-sized particles. Aggregate size did strongly influence the loss potential of P coll in paddy soils, where P coll contributed up to 83% TDP in the silt+clay sized particles. The P coll content was positively correlated with TP, Al, Fe and mean weight diameter (MWD). Aggregate associated total carbon (TC), total nitrogen (TN), C/P, and C/N had significant, but negative effects on the contribution of P coll to potential soil P losses. The P coll content of the aggregates was controlled by aggregate associated TP and Al content as well as soil pH value, with P coll loss potential from aggregates being controlled by its organic matter content.Conclusion Therefore, we conclude that management practices that increase soil aggregate stability or its organic carbon content will limit P coll loss from agricultural systems.

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Long‐term Effects of Organic Waste Fertilizers on Soil Structure, Tracer Transport, and Leaching of Colloids

Cited by 19 publications

References 46 publications

Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Particle Leaching Rates from a Loamy Soil Are Controlled by the Mineral Fines Content and the Degree of Preferential Flow

Increase soil aggregate stability can limit colloidal phosphorus loss potentials from agricultural systems

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