Clay behavior following macroaggregate breakdown in Ferralsols

Melo, Thadeu Rodrigues de; Figueiredo, Alex; Filho, João Tavares

doi:10.1016/j.still.2020.104862

Cited by 10 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these previous studies, the positive effect of SOM on soil aggregate development was attributed to the increment in van der Waals force between soil particles. However, different from our study, Melo et al 12 reported that Londrina soil with high SOC released greater water dispersible clay (60–80%) than that in Rondon with low SOC (50–70%) after mechanical breakdown of macroaggregate. This was probably due to the repulsive force prevailing attractive force between soil particles as affected by more negative zeta potential or surface potential 8 .…”

Section: Discussioncontrasting

confidence: 99%

“…The zeta potential of manure and NPK + straw treatments having high SOC agreed with earlier studies in Marchuk et al 9 that decreases of SOC via NaOH treatments decreased the negative zeta potential value 9 , where Claremont soil originally having high SOC (2.2%) displayed a greater degree of decline in negative zeta potential (from − 29 to − 34.9 mV) than Urrbrae having lower SOC (1.4%) (− 66.3 to − 68 mV). However, zeta potential in water dispersible clay responded to SOC contrastly in the study of Melo et al 12 , where Londrina soil with high SOC (5–20 g kg −1 ) displayed lower negative zeta potential values in water dispersible clay than that in Rondon soil (SOC 5 to 12 g kg −1 ) in subtropical Brazil.…”

Section: Discussionmentioning

confidence: 59%

“…Differences of SOC effect on zeta potential in our study and other studies were probably because ionic strength in bulk solution also affected the intensity of soil charge imbalance. Generally, in tropical and subtropical Ferralsols, high amounts of SOM that was released following the breakdown of macroaggregate provided an excess of negative charges and intensified the imbalance in charge, resulting in more negative in zeta potential of clay 12 . In contrast to Ferralsols in Brazil, red soil (highly-weathered) in our study showed higher negative zeta potential in manure soils with higher SOM.…”

Section: Discussionmentioning

confidence: 99%

“…For example, an Ultisol having high SOC after straw treatments enhanced the release of small particles (< 5 µm) 8 . Small particles of some types of Ferralsols with high SOC in subtropical climate of Brazil were difficult to re-flocculate when they were released from mechanical breakdown of macroaggreates 12 . There must exist other soil properties that limit the roles of SOC and induce repulsive force prevailing attractive force between soil particles.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Soil organic matter and clay zeta potential influence aggregation of a clayey red soil (Ultisol) under long-term fertilization

Yang

Huang

et al. 2021

Sci Rep

View full text Add to dashboard Cite

The effect of soil organic matter (SOM) on aggregation of variably-charged red soils (Ultisol) through clay zeta potential is not fully understood. Therefore, the objectives of this study were to investigate the SOM effect on the clay zeta potential and soil aggregation after fertilization. Soils under 17 years of fertilization (manure, NPK + straw, NPK, and control (CK) were adjusted by KCl solution to reach varying soil pH and concentration in order to determine clay zeta potential, cations, and aggregate size distribution. The SOM content and C-functional groups by 13C-NMR analysis were also determined. Results showed that the negative zeta potential displayed a bell-shaped pattern with increasing concentration of KCl, but displayed different amplitude of variation among treatments. Manure had the highest zeta potential value and its degree of variation in relative to the value at KCl concentration of 0.1 mol L−1 (19%), NPK + straw and NPK treatments were similar, and CK was the least. Greater negative zeta potential for manure treatment was attributed to higher SOM content, aromatic-C functional groups, and their greater concentrations of Ca2+ and Mg2+ than did the CK. As a result, higher SOM and clay zeta potential yielded in less release of amount of soil particles (< 10 μm) (r = − 0.46*) and enhanced water stable macroaggregates for manure instead of NPK + straw. Long-term manure fertilization would be suggested as a conservation practice for red soil due to its increase in soil aggregate stability and negative zeta potential in subtropical climate.

show abstract

Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Soil organic matter and clay zeta potential influence aggregation of a clayey red soil (Ultisol) under long-term fertilization

Yang

Huang

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Larger organic residues were manually removed before analysis. Additionally, sieves with 0.053 mm openings were not considered necessary because these soils do not disperse spontaneously in water [see Figure S2 in Melo et al (2021)]. The mean weighted diameter was calculated according to equation 2.…”

Section: Stability Of Aggregates In Watermentioning

confidence: 99%

Aggregation rate as a function of soil organic matter in heavy clayey Ferralsols

Melo¹,

Pereira²,

Shimizu³

et al. 2022

Revista Brasileira De Ciência Do Solo

Self Cite

View full text Add to dashboard Cite

Heavy clayey Ferralsols are known for their high capacity to form waterstable macroaggregates. However, little is known about how different size classes of macroaggregates exchange mass with increasing organic matter content. This study aimed to characterize and detail aggregation dynamics with increasing organic matter content in these soils. Profiles of three heavy clayey Ferralsols were sampled to isolate the role of organic matter on the stability of aggregates. In this sampling scenario, a conceptual model was established to calculate the aggregation rate of different size classes of water-stable aggregates. This approach allowed the establishment of a critical value for classifying microaggregates in the studied soils (≤0.50 mm) based on their behavior as "building blocks" for macroaggregates when organic matter content is increased. In surface soil layers, where organic matter is higher, most dynamics are expected to happen between macroaggregates classes because free microaggregates are scarce. Consequently, it is important to subdivide macroaggregates into different size classes when evaluating their stability. Quantifying macroaggregates as a single class (e.g., >0.25 or >0.50 mm) was insufficient in representing the macroaggregation dynamics in heavy clayey Ferralsols.

show abstract

Enhancing Soil Organic Carbon Content and Water Retention Using Polyvinyl Alcohol Cross-linked with Chitosan and Pectin

Soliman,

Mansour

2024

J Soil Sci Plant Nutr

View full text Add to dashboard Cite

Soil organic carbon is considered a candidate without a substitute to be an important indicator of soil degradation by monitoring its amount and changes over time. Organic compounds such as chitosan (CS) and pectin (PC) can increase organic matter content in soils and provide a carbon source for microbes. Organic nanoparticles (NPs) were prepared by polymerization of CS and PC with polyvinyl alcohol (PVA), loaded with NPK nutrients, and evaluated by transmission electron microscope as well as zeta-potential (ZP). This study aims to test the effect of organic NPs on soil organic carbon (SOC) content, available water capacity (AWC), and growth of wheat plant. Thus, a pot experiment was conducted using clay soil. The treatments were NPK at two levels, viz., 50 and 85% of the recommended doses in combination with CS/PVA and PC/PVA as nano-carrier materials, as well as control treatment (85% NPK). Results showed that the loading of organic NPs with NPK nutrients obviously increases the solution stability and the positive as well as negative charges for CS/PVA (50.30 mV) and PC/PVA (− 17.80 mV), respectively. Furthermore, the using of NPK nano-fertilizers was significant for all the studied properties. Likewise, the addition of CS/PVA loaded with NPK decreased soil ZP at a range of − 13.00 to − 16.90 mV. Besides, it shows better carbon-cycling activity by increasing SOC at a range of 9.71 to 11.68 g kg−1. The PC/PVA loaded with 50%NPK not only increases AWC with a rate of 18.23% but also sustains water-release synchronization to meet wheat plant demands.

show abstract

Clay behavior following macroaggregate breakdown in Ferralsols

Cited by 10 publications

References 17 publications

Soil organic matter and clay zeta potential influence aggregation of a clayey red soil (Ultisol) under long-term fertilization

Soil organic matter and clay zeta potential influence aggregation of a clayey red soil (Ultisol) under long-term fertilization

Aggregation rate as a function of soil organic matter in heavy clayey Ferralsols

Enhancing Soil Organic Carbon Content and Water Retention Using Polyvinyl Alcohol Cross-linked with Chitosan and Pectin

Contact Info

Product

Resources

About