Mapping clay content variation using electromagnetic induction techniques

Triantafilis, John; Lesch, Scott M.

doi:10.1016/j.compag.2004.11.006

Cited by 178 publications

(120 citation statements)

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“…This suggests that the dipole EM38 signal explains between 63 and 75% of the apparent gravel, sand, silt, and clay variability in the field. These correlations are comparable to other research where R 2 estimates were reported to be 0.761 and 0.741 for clay and sand models, respectively , and 0.73 for clay content (Robinson et al 2008), slightly less than the R 2 estimates of 0.82 for clay content (Triantafilis and Lesch 2005) and higher than other research reporting R 2 estimates of 0.15-0.62 for the silt fraction and 0.37-0.63 for clays (Sadduth et al 2005), and R 2 values of 0.548 and 0.406 for clay and sand content, respectively (Lukas et al 2009). Correlation coefficients were slightly lower and ranged from a high of 73.2 and low of 48.8% when ECa measurements determined using VERIS were correlated with gravel, sand, silt, and clay content (Table 2; Fig.…”

Section: Em38 and Veris Comparisonssupporting

confidence: 86%

“…ECa mapping can be used to accurately detect temporal changes in soil water content, when calibrated for salinity (Sheets and Hendrickx 1995;Andreu et al 1997;Hanson et al 2000). Since 1987, at least fourteen studies have evaluated soil ECa as indicator of soil texture with most focusing on clay soils and clay content under annual cropping systems (Sudduth et al 2005;Triantafilis and Lesch 2005). Studies have also used ECa mapping to improve upon the understanding of soil properties in relation to landscape position and annual crop production (Jones et al 1989).…”

Section: Introductionmentioning

confidence: 99%

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Using EM and VERIS technology to assess land suitability for orchard and vineyard development

et al. 2010

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Orchard and vineyard producers conduct preplant site evaluations to help prevent planting permanent tree and vine crops on lands where the crop will not perform to its highest potential or attain its full life expectancy. Physical soil characteristics within specific soil profiles and spatially throughout an orchard influence decisions on land preparation, irrigation system selection, horticultural choices, and nutrient management. Producers depend on soil surveys to help them understand the soil characteristics of the land and may be interested in technology that provides additional information. Electromagnetic induction (EM38) and four-probe soil resistance sensors (VERIS) are being used in combination with global positioning systems to map spatial variability of soils using apparent soil electrical conductivity (ECa). The hypothesis evaluated in this study is whether rapid, in situ, and relatively low-cost methods of measuring ECa (EM38 and VERIS) can effectively identify and map physical soil variability in non-saline soils. The supposition is that in non-saline soils, ECa levels will relate well to soil texture and water-holding capacity and can be used to map physical soil variability. In turn, the information can be used to guide decisions on preplant tillage, irrigation system design, water and nutritional management, and other horticultural considerations. Two sites in the Sacramento Valley were mapped each with EM38 and VERIS methods. Site-specific management zones were identified by each provider on ECa maps for each site, and then soil samples were collected by University of California researchers to verify these zones. Results showed that on non-saline soils, ECa measured with both EM38 and VERIS correlate with physical soil properties such as gravel, sand, silt, and clay content but the relationship between conductivity and these physical soil properties varied from moderately strong to weak. The strength of the correlation may be affected by several factors including how dominant soil texture is on conductivity relative to other soil properties and on methods of equipment operation, data analysis and interpretation. Overall, the commercial providers of ECa surveys in this study delivered reasonable levels of accuracy that were consistent with results reported in previous studies. At one site, an ECa map developed with VERIS provided more detail on physical soil variability to supplement published soil surveys and aided in the planning and development of a walnut orchard. At a second site, almond yield appeared to correlate well with distinctly different soil zones identified with EM38 mapping.

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Section: Em38 and Veris Comparisonssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Using EM and VERIS technology to assess land suitability for orchard and vineyard development

et al. 2010

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“…The ECa correlates with various soil properties such as salinity (Rhoades et al, 1999), clay content (Triantafilis &Lesch, 2005 andWuddivira et al, 2012), water content (Haimelin, 2008) and carbon content (Martinez et al, 2009). The ECa can be used as an indirect indicator for identifying some important soil properties including soil salinity, clay content, cation exchange capacity, soil moisture content, and temperature (McNeill, 1992 andRhoades et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Mapping of Soil Salinity Using Electromagnetic Induction: A Case Study of East Nile Delta, Egypt

2017

Egypt.J. Soil Sci.

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“…Apparent soil electrical conductivity correlates with va rious physicochemical soil properties such as salinity (Rhoades et al, 1999), clay content (Triantafilis and Lesch, 2005;Wuddivira et al, 2012), water content (Haimelin, 2008) and carbon content (Martinez et al, 2009). Recently, Atwell et al (2013) and Bréchet et al (2012) showed that under humid tropical conditions, variation in ECa was influenced by temporal changes in soil moisture content, spatial variation of claysilt mineral content, soil solution electrical conductivity (ECe) and soil water repellency.…”

Section: Introductionmentioning

confidence: 99%

Assessing the temporal stability of spatial patterns of soil apparent electrical conductivity using geophysical methods

Caires

Wuddivira

Bekele

2014

International Agrophysics

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A b s t r a c t. Cocoa remains in the same field for decades, resulting in plantations dominated with aging trees growing on variable and depleted soils. We determined the spatio-temporal variability of key soil properties in a (5.81 ha) field from the International Cocoa Genebank, Trinidad using geophysical methods. Multi-year (2008Multi-year ( -2009) measurements of apparent electrical conductivity at 0-0.75 m (shallow) and 0.75-1.5 m (deep) were conducted. Apparent electrical conductivity at deep and shallow gave the strongest linear correlation with clay-silt content (R = 0.67 and R = 0.78, respectively) and soil solution electrical conductivity (R = 0.76 and R = 0.60, respectively). Spearman rank correlation coefficients ranged between 0.89-0.97 and 0.81-0.95 for apparent electrical conductivity at deep and shallow, respectively, signifying a strong linear dependence between measurement days. Thus, in the humid tropics, cocoa fields with thick organic litter layer and relatively dense understory cover, experience minimal fluctuations in transient properties of soil water and temperature at the topsoil resulting in similarly stable apparent electrical conductivity at shallow and deep. Therefore, apparent electrical conductivity at shallow, which covers the depth where cocoa feeder roots concentrate, can be used as a fertility indicator and to develop soil zones for efficient application of inputs and management of cocoa fields.

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Mapping clay content variation using electromagnetic induction techniques

Cited by 178 publications

References 50 publications

Using EM and VERIS technology to assess land suitability for orchard and vineyard development

Using EM and VERIS technology to assess land suitability for orchard and vineyard development

Mapping of Soil Salinity Using Electromagnetic Induction: A Case Study of East Nile Delta, Egypt

Assessing the temporal stability of spatial patterns of soil apparent electrical conductivity using geophysical methods

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