Gas permeability and water retention of a repacked silty sand amended with different particle sizes of peanut shell biochar

2020 ◽  
Vol 84 (5) ◽  
pp. 1630-1641
Author(s):  
Zhongkui Chen ◽  
Chaowei Chen ◽  
Viroon Kamchoom ◽  
Rui Chen
Keyword(s):  
Water Retention ◽  
Gas Permeability ◽  
Silty Sand ◽  
Particle Sizes ◽  
Peanut Shell

scholarly journals Determination of the Soil Water Retention Curve Using the Flow Pump

2015 ◽  
Vol 68 (2) ◽  
pp. 207-213
Author(s):  
Luciana Portugal Menezes ◽  
Waldyr Lopes Oliveira Filho ◽  
Cláudio Henrique Carvalho Silva
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Unsaturated Flow ◽  
Silty Sand ◽  
Water Retention Curve ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Retention Curve ◽  
Flow Problems ◽  
Flow Pump

AbstractReliable measurements of the Soil Water Retention Curve, SWRC, are necessary for solving unsaturated flow problems. In this sense, a method to obtain the SWRC of a silty sand using a flow pump, as well as details about procedures and some results, are herein presented. The overall conclusion is that the new method is very convenient, fully automated, and produces reliable results in a fast and easy way, making the technique very promising.

Investigation into water retention and gas permeability of Opalinus clay

2018 ◽  
Vol 77 (5) ◽  
Author(s):  
Jiang-feng Liu ◽  
Yu Wu ◽  
Cheng-Zheng Cai ◽  
Hong-yang Ni ◽  
Xu-lou Cao ◽  
...  
Keyword(s):  
Water Retention ◽  
Gas Permeability ◽  
Opalinus Clay

scholarly journals Experimental research on water retention and gas permeability of compacted bentonite/sand mixtures

2014 ◽  
Vol 54 (5) ◽  
pp. 1027-1038 ◽  
Author(s):  
Jiang-Feng Liu ◽  
Frédéric Skoczylas ◽  
Jian Liu
Keyword(s):  
Experimental Research ◽  
Water Retention ◽  
Gas Permeability ◽  
Compacted Bentonite

The Relationship Between Colliery-waste Particle Sizes and Plant Growth

1974 ◽  
Vol 1 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Christopher G. Down
Keyword(s):  
Particle Size ◽  
Plant Growth ◽  
Water Retention ◽  
Size Range ◽  
Growth Period ◽  
Dry Weight ◽  
Particle Sizes ◽  
Small Particles ◽  
The Relationship ◽  
Water Holding

Seed germination and dry-weight production in Lolium perenne were examined in relation to growth on 12-years-old colliery waste separated into seven size-fractions. The size-range was from more than 4,000 μ to less than 125 μ, and the growth period was up to 30 days. Germination percentages after 6 days generally increased with decreasing particle-size, as did dry-weight. Shoot : root ratios also showed an inverse relationship with particle size.After 30 days there was no distinction between dryweights on different particle sizes, except that on the largest fractions it had been found impossible to keep the plants alive. Problems of water-holding capacity are discussed, and the significance of soil particle-size in revegetation work is examined, it being concluded that an admixture of small particles is important for water retention and plant growth.

Effect of biochar type on infiltration, water retention and desiccation crack potential of a silty sand

Biochar ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 465-478
Author(s):  
Rojimul Hussain ◽  
Sanandam Bordoloi ◽  
Piyush gupta ◽  
Ankit Garg ◽  
K. Ravi ◽  
...  
Keyword(s):  
Water Retention ◽  
Silty Sand ◽  
Desiccation Crack

Isotropic yielding of unsaturated cemented silty sand

2013 ◽  
Vol 50 (8) ◽  
pp. 807-819 ◽  
Author(s):  
M. Arroyo ◽  
M.F. Amaral ◽  
E. Romero ◽  
A. Viana da Fonseca
Keyword(s):  
Water Content ◽  
Water Retention ◽  
Void Ratio ◽  
Dry Weight ◽  
Silty Sand ◽  
Initial Void Ratio ◽  
Naturally Occurring ◽  
Experimental Campaign ◽  
Hardening Mechanisms ◽  
Designed Materials

Unsaturated cemented soils are frequent both as designed materials and as naturally occurring layers. Both desiccation and cementation act separately as hardening mechanisms, but it is not clear how exactly their effects combine. Do they enhance one another? Are they mutually reinforcing? This study presents results from an experimental campaign aimed at answering these questions. Five different mixtures of soil (a granite saprolite) and cement (with cement contents in the range 0% to 7% on a dry weight basis) are tested in isotropic compression at four different water content levels. Initial void ratio is also controlled, using two initial compaction densities. Loading is performed at constant water content and suction is inferred from a set of water retention curves obtained from parallel psychrometric and pore-size distribution measurements. The range of yield stresses explored in this study covers almost two orders of magnitude and extends up to 7 MPa at suction values of up to 14 MPa. Both desiccation and cementation increase yield stress, but their effects are less marked when both act together, and therefore they are not mutually reinforcing.

scholarly journals Influence of soil density on gas permeability and water retention in soils amended with in-house produced biochar

2021 ◽  
Author(s):  
Ankit Garg ◽  
He Huang ◽  
Weiling Cai ◽  
Narala Gangadhara Reddy ◽  
Peinan Chen ◽  
...  
Keyword(s):  
Water Retention ◽  
Gas Permeability ◽  
Soil Density

scholarly journals A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ankit Garg ◽  
Sanandam Bordoloi ◽  
Suriya Prakash Ganesan ◽  
Sreedeep Sekharan ◽  
Lingaraj Sahoo
Keyword(s):  
Stomatal Conductance ◽  
Soil Water ◽  
Water Uptake ◽  
Water Retention ◽  
Root Zone ◽  
Clayey Loam ◽  
Silty Sand ◽  
Water Retention Curve ◽  
Soil Matrix ◽  
Photosynthetic Status

AbstractPermanent wilting point (PWP) is generally used to ascertain plant resistance against abiotic drought stress and designated as the soil water content (θ) corresponding to soil suction (ψ) at 1500 kPa obtained from the soil water retention curve. Determination of PWP based on only pre-assumed ψ may not represent true wilting condition for soils with contrasting water retention abilities. In addition to ψ, there is a need to explore significance of additional plant parameters (i.e., stomatal conductance and photosynthetic status) in determining PWP. This study introduces a new framework for determining PWP by integrating plant leaf response and ψ during drought. Axonopus compressus were grown in two distinct textured soils (clayey loam and silty sand), after which drought was initiated till wilting. Thereafter, ψ and θ within the root zone were measured along with corresponding leaf stomatal conductance and photosynthetic status. It was found that coarse textured silty sand causes wilting at much lower ψ (≈ 300 kPa) than clayey loam (≈ 1600 kPa). Plant response to drought was dependent on the relative porosity and mineralogy of the soil, which governs the ease at which roots can grow, assimilate soil O2, and uptake water. For clay loam, the held water within the soil matrix does not facilitate easy root water uptake by relatively coarse root morphology. Contrastingly, fine root hair formation in silty sand facilitated higher plant water uptake and doubled the plant survival time.

scholarly journals The role of biochar particle size and hydrophobicity in improving soil hydraulic properties

2021 ◽  
Author(s):  
Ifeoma Edeh ◽  
Ondřej Mašek
Keyword(s):  
Particle Size ◽  
Hydraulic Conductivity ◽  
Soil Water ◽  
Hydraulic Properties ◽  
Water Retention ◽  
Sandy Loam ◽  
Particle Sizes ◽  
Soil Hydraulic Properties ◽  
Soil Water Retention ◽  
Soil Hydraulic

<p>The physical properties of biochar have been shown to dramatically influence its performance as a soil amendment. Biochar particle size is one of key parameters, as it controls its specific surface area, shape, and pore distribution. Therefore, this study assessed the role of biochar particle size and hydrophobicity in controlling soil water movement and retention. Softwood pellet biochar in five particle size ranges (>2 mm, 2 – 0.5 mm, 0.5 – 0.25 mm, 0.25 – 0.063mm and <0.063 mm) was used for the experiment. These particle sizes were tested on 2 soil types (sandy loam and loamy sand) at four different application rates (1, 2, 4 and 8%).  Our results showed that biochar hydrophobicity increased with decreasing biochar particle size, leading to a reduction in its water retention capacity. The effect of biochar on soil hydraulic properties varied with different rate of application and particle sizes. With increasing rate of application, water retention increased while hydraulic conductivity decreased. Water content at field capacity, permanent wilting point, and the available water content increased with increasing biochar particle size. The soil hydraulic conductivity increased with decreasing particle sizes apart from biochar particles <0.063mm which showed a significant (p≤0.05) decrease compared to the larger particle sizes. The results clearly showed that both biochar intra-porosity and inter-porosity are important factors affecting soil hydraulic properties. Biochar interpores affected mainly hydraulic conductivity, both interpores and intrapores controlled soil water retention properties. Our results suggest that for a more effective increase in soil water retention in sandy loam and loamy sand, the use of hydrophilic biochar with high intra-porosity is recommended.</p>

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