Soil Amendments Addition Affecting Soil Physical and Chemical Properties

A special issue of Agriculture (ISSN 2077-0472). This special issue belongs to the section "Agricultural Soils".

Deadline for manuscript submissions: 25 May 2025 | Viewed by 2270

Special Issue Editors


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Guest Editor
School of Energy Resources, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
Interests: soil organic matter; soil carbon; soil bulk density; soil porosity; soil pH; soil EC; cation exchange capacity; soil nutrients; soil health; salinity; base saturation; trace elements

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Guest Editor
Department of Agronomy and Horticulture, Panhandle Research, Extension, and Education Center, University of Nebraska-Lincoln, Scottsbluff, NE 69361, USA
Interests: soil organic carbon and nitrogen dynamics; regenerative agricultural practices; soil biology; greenhouse gas emissions; nutrients and water management

Special Issue Information

Dear Colleagues,

Soil degradation threatens food production and constitutes a serious problem worldwide. Conversely, ameliorating degradation and improving soil properties via the selection of appropriate soil amendments are methods of increasing agricultural production.

This Special Issue focuses on the impact of soil amendments on the physical and chemical properties of soil. The studies we present examine how various amendments can alter soil organic matter, soil carbon, soil water holding capacity, soil bulk density, soil nutrient availability, and overall soil health.

One key theme across the articles is the importance of understanding how different amendments interact with soil particles and organic matter in order to affect soil properties. The findings presented in this Special Issue have significant implications for agricultural practices, as they highlight the potential of soil amendments to improve soil quality and productivity. Farmers and land managers can make informed decisions about enhancing soil health and sustainability by understanding how amendments influence soil physical and chemical properties.

Overall, this Issue offers valuable insights into the complex relationships between soil amendments and soil physical and chemical properties, paving the way for the development of more effective soil management strategies in the future.

As such, this publication is open to high-quality articles in the fields of agriculture and soil science, including plant science and environmental management studies. We are particularly eager to publish articles and reviews that represent original research.

Dr. Resham B. Thapa
Dr. Vesh Raj Thapa
Guest Editors

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Keywords

  • soil organic matter
  • soil carbon
  • soil bulk density
  • soil porosity
  • soil pH
  • soil EC
  • cation exchange capacity
  • soil nutrients
  • soil health

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Published Papers (2 papers)

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Research

18 pages, 2897 KiB  
Article
Influence of Biochar Organic Carbon Composition and Thermal Stability on Nitrate Retention and Tomato Yield on Soilless Biochar Amended Growth Media
by George K. Osei, Lucy W. Ngatia, Michael D. Abazinge, Alejandro Bolques, Charles Jagoe, Marcia A. Owens, Benjamin Mwashote and Riqiang Fu
Agriculture 2025, 15(8), 865; https://doi.org/10.3390/agriculture15080865 - 16 Apr 2025
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Abstract
The application of biochar to traditional soil and soilless growth media in agriculture has been reported to increase plant production. However, it remains unclear which biochar component drives this process or which biogeochemical process is attributed to better plant productivity. Therefore, this study [...] Read more.
The application of biochar to traditional soil and soilless growth media in agriculture has been reported to increase plant production. However, it remains unclear which biochar component drives this process or which biogeochemical process is attributed to better plant productivity. Therefore, this study aims to determine how biochar organic carbon (C) composition and thermal stability influence nitrogen availability and tomato production. Soilless growth media composed of a mixture of 60% and 40% coconut coir (CC) (Cocos nucifera L.) and fine pine bark (PB) (Pinus genus), respectively, was amended with 0, 1, 2, 3, 4, 6, 8, 10, and 12% biochar per dry weight. The amended media were used to grow Red Bounty tomatoes (Lycopersicum esculentum) for three months. After harvesting tomatoes and determining yield, organic C composition and C thermal stability of the biochar amended soilless growth media mixtures were determined using solid-state 13C nuclear magnetic resonance (13C NMR) and multi-elemental scanning thermal analysis (MESTA), respectively. Thermal stability data were used to determine the “R400 index”, and nitrate (NO3) concentration was determined using the water extractable method. Results showed that biochar-amended media significantly increased pH (p < 0.0001) and NO3 (p = 0.0386) compared to the no-char control. Biochar amended soilless media organic C composition was dominated by O-alkyl-C as a result of a higher fraction of soilless media; however, total C, carboxyl-C, phenolic-C, and aromatic-C increased with increasing biochar content and related negatively to R400, which decreased with increasing biochar content. Nitrate retention and tomato yield increased with increasing total C, carboxyl-C, phenolic-C, and aromatic-C and decreasing R400. This indicates that the stable form of C, carboxyl-C, phenolic-C, aromatic-C, and low R400 enhanced NO3 sorption, reducing leaching and enhancing its availability for tomato growth. Full article
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18 pages, 2878 KiB  
Article
Basalt Rock Dust Amendment on Soil Health Properties and Inorganic Nutrients—Laboratory and Field Study at Two Organic Farm Soils in New England, USA
by Justin B. Richardson
Agriculture 2025, 15(1), 52; https://doi.org/10.3390/agriculture15010052 - 28 Dec 2024
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Abstract
Basalt rock dust (RD) is a rock quarry byproduct that may improve soil health in organic farming systems. RD was applied at two contrasting organic farms (the no-till VT-Farm in Thetford, Vermont, and the tilled MA-Farm in Barre, Massachusetts) and in soil batch [...] Read more.
Basalt rock dust (RD) is a rock quarry byproduct that may improve soil health in organic farming systems. RD was applied at two contrasting organic farms (the no-till VT-Farm in Thetford, Vermont, and the tilled MA-Farm in Barre, Massachusetts) and in soil batch reactors to investigate the impacts of basalt RD applications (6.7 tons ha−1) on physical and chemical soil health properties. Triplicate soil pits at two fields (RD and no RD) at each farm were sampled down between 80 to 110 cm depths in 2020. Median coarse (>2 mm) and very coarse aggregates (>50 mm) increased by 15% to 25%, and soil organic carbon concentrations increased by 69% to 135% for RD added, compared to no RD, in the top 20 cm of the soil profile at both farms. Plant-available Ca, Mg, and K increased between 62% and 252% in the top 30 cm for both farms. Plant-available micronutrients (B, Mn, Cu, and Zn) showed limited increases from the RD addition at the two farms. The laboratory batch reactor results confirm the increased Ca and Mg release rates tested across soils, but K, P, and the micronutrient batch reactor results did not increase from the RD addition. One contrary finding was (−41% at the VT-Farm) the lower plant-available P and soluble P (−5 to −29%) under the RD addition, suggesting that further studies on the interactions with Fe and pH from the RD addition are warranted. Full article
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