The relationship between apparent soil electrical conductivity and soil properties

Valente, Domingos Sárvio Magalhães; Queiroz, Daniel Marçal de; Pinto, Francisco de Assis de Carvalho; Santos, Nerílson Terra; Santos, Fábio Lúcio

doi:10.1590/s1806-66902012000400009

Cited by 25 publications

(15 citation statements)

References 25 publications

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“…Soil particles were determined using the methods described by soil survey staff [16], w here three fractions (sand, silt, clay) were separated. Soil pH H2O as well as electrical conductivity (EC) were measured in an aqueous solution at a soil/distilled water ratio as 1:2.5, [17]. Moreover, pH was additionally [20][21].…”

Section: Soil Chemical Analysesmentioning

confidence: 99%

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

Diatta¹,

Andrzejewska²,

Chudzińska³

et al. 2016

Pol. J. Environ. Stud.

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The aim of our study was to evaluate the mobility of Zn in soils subjected to the activity of a zinc smelter and to assess the contamination of 1-and 2-year-old needles of Scots pine species sensitive to and tolerant of heavy metal contamination, particularly zinc. The trees were selected on the basis of their morphology, i.e., tolerant ones exhibited quite normal growth shape, but sensitive ones were more or less dwarves. Mineralogical composition revealed the prevalence of kaolinite in all soils except for two samples, where smectite dominated. Zinc contamination exceeded 30 times the geochemical background, and the reactive Zn forms represented 34.6% of total Zn content (Zn Total ). Proton generation capacity (α) indices calculated for the bioavailable Zn fraction (Zn Bio ) were 59% higher compared to the reactive Zn pool (Zn Reac ). Two-year-old tolerant (T) pine needles accumulated 21.9, 38.2, and 13.6% more Zn, Fe, and Mg, respectively, as compared to 1-year-old ones. For sensitive (S) needles, the range followed: 12.4, 48.8, and 7.3%, respectively. Iron was considered a "strategic survival element" for both pines growing under high zinc pollution.The transfer of Zn ions from the soil environment to plants still remains the basic source of maintaining its high concentrations in the needles, since air emissions ceased in 1996. The amounts of Zn accumulated by Scots pine at crucial years of metallurgical emissions may be considered as an additional time-constant source due to the evergreen vegetative lifecycle.

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Section: Soil Chemical Analysesmentioning

confidence: 99%

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

Diatta¹,

Andrzejewska²,

Chudzińska³

et al. 2016

Pol. J. Environ. Stud.

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“…Portanto, ela se relaciona à textura, à capacidade de troca catiônica, ao conteúdo de água, à salinidade, e à declividade e acidez do solo (Lund et al, 1999;Valente et al, 2012;. No entanto, essas relações são, geralmente, intrínsecas a cada tipo de solo e local investigado (Moral et al, 2010).…”

Section: Introductionunclassified

“…Ainda, como a CE apresenta elevada relação com a CEa (Lund et al, 1999), o sensoriamento em tempo real poderia reduzir o tempo e os gastos com a amostragem intensa de solo e suportaria a adoção de estratégias de manejo sítio-específico na cultura do milho (Zea mays L.), tais como a escolha de híbridos, a definição da população de plantas e os níveis de fertilização nitrogenada (Peralta et al, 2015). Contudo, trabalhos com sensoriamento em tempo real do solo, por CEa, ainda são pontuais e em Latossolos do Centro-Oeste (Brandão et al, 2011;Valente et al, 2012;Sana et al, 2014) e, portanto, insuficientes para recomendações em regiões distintas daquelas investigadas, como é o caso dos Latossolos do Sul do Brasil.…”

Section: Introductionunclassified

Espacialização em alta resolução de atributos da acidez de Latossolo por meio de sensoriamento em tempo real

Corassa

Amado

Tabaldi

et al. 2016

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar as relações da condutividade elétrica aparente (CEa), determinada por sensoriamento em tempo real, com os atributos do solo e com a produção vegetal, além de espacializar de forma indireta e em alta resolução os componentes da acidez de um Latossolo Vermelho distrófico no Sul do Brasil. O sensoriamento do solo foi realizado em duas áreas agrícolas, com o sensor Veris 3100. O solo foi amostrado à profundidade de 0,00-0,15 m, com trado calador. Avaliou-se o índice de vigor do milho (IV) com um sensor óptico, e a produtividade com sensores de produtividade e umidade. A associação dos atributos da acidez do solo com a produtividade do milho e com a CEa foi determinada por meio de análises de correlação e de componentes principais. A CEa relacionou-se ao IV e à produtividade de milho. Além disso, na área com qualidade química inferior, a CEa apresentou relação positiva com os conteúdos , matéria orgânica do solo e teor de argila.Termos para indexação: agricultura de precisão, condutividade elétrica, fertilidade do solo, manejo sítio-específico, matéria orgânica do solo, variabilidade espacial. High-resolution spacialization of an Oxisol's acidity attributes by on-the-go sensingAbstract -The objective of this work was to evaluate the relationships between the apparent electric conductivity (ECa), measured by on-the-go sensing, with soil attributes and plant production, besides indirectly mapping with high resolution, the main acidity attributes of an Oxisol in South Brazil. Soil sensing was performed in two crop fields using the Veris 3100 sensor. Soil was sampled at the 0.00-0.15-m soil depth using a hand auger. The corn vigor index (VI) was measured with an optical sensor, and yield was determined using grain yield and moisture sensors. contents, soil organic matter, and clay content.

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“…Many studies have reported the relationship of EC a with other soil attributes, including texture, water content, salinity, pH, cation exchange capacity (TERRÓN et al, 2011;HEIL;SCHMIDHALTER, 2011;ISLAM et al, 2012;SERRANO et al, 2012;VALENTE et al, 2012a) and crop yield (MANN et al, 2011;ALCÂNTARA et al, 2012). Therefore, EC a mapping may provide a rapid and effective means of identifying areas with similar features at a lower cost, allowing for needsbased management (FAROOQUE et al, 2012;VALENTE et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

The temporal stability of the variability in apparent soil electrical conductivity

Medeiros¹,

Queiroz²,

Valente³

et al. 2016

Biosci. J.

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Apparent soil electrical conductivity (EC a ) measurements can be used for crop management in precision agriculture. However, EC a is a soil attribute that presents spatial and temporal variability. It is affected by a group of factors that act simultaneously on the soil, such as the soil texture, moisture content, organic matter content and ionic concentrations in the soil solution, which complicates analysis. For soil and crop management, it is important to determine whether the pattern of the EC a spatial variability changes over time. Thus, EC a measurements have the potential for delimiting management zones that are stable over time. The objective of this work was to determine whether the spatial variability pattern of EC a is maintained over time and under different soil conditions. To this end, the EC a was measured at different soil depths using a portable sensor on two crop fields. The first step was to measure and generate an EC a map for each area. By defining a path with the maximum EC a variability, 50 sampling points were located on each field. The EC a values were measured on 20 different dates in the 0 -20 cm, 0 -40 cm and 0 -60 cm soil layers. The soil water content was measured at the same points in the 0 -20 cm layer on the same dates. The temporal stability of the EC a was analyzed using spatial and temporal variability maps, a correlation analysis and a coefficient of variation over time for each field. In both areas, the EC a exhibited temporal stability in the spatial pattern variability at the three evaluated depths, even though the soil water content values changed on each date. EC a determination presents an important alternative for mapping agricultural fields for crop management in precision agricultural systems.

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The relationship between apparent soil electrical conductivity and soil properties

Cited by 25 publications

References 25 publications

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

Espacialização em alta resolução de atributos da acidez de Latossolo por meio de sensoriamento em tempo real

The temporal stability of the variability in apparent soil electrical conductivity

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