Apparent Soil Electrical Conductivity
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. SPATIAL VARIABILITY OF SOIL APPARENT ELECTRICAL CONDUCTIVITY - EFFECT OF THE NUMBER OF SUBSAMPLES
ABSTRACT Soil apparent electrical conductivity (ECa) sensors have been used to detect spatial variability because they correlate with soil attributes. Studies with soil attributes have shown that the number of subsamples and sampling points influences mapping. However, there are no studies that investigated the influence of sampling or subsampling density on
Eng. Agríc.. Publicado em: 2021-05
-
2. Repeated geophysical measurements in dry and wet soil conditions to describe soil water content variability
ABSTRACT: There is an increasing interest in the application of geophysical surveys to assess the soil water content (SWC) variation in both spatial and temporal scales. In this work, a geophysical survey was carried out at an experimental farm in dry and wet conditions. We determined the SWC data measured with the gravimetric method, apparent electrical con
Sci. agric. (Piracicaba, Braz.). Publicado em: 20/12/2019
-
3. Influence geometric anisotropy in management zones delineation
RESUMO O manuseio adequado do solo, além de permitir a redução de contaminantes e a maximização da produtividade agrícola, está diretamente relacionado ao conhecimento da variabilidade espacial dos atributos do solo. Esta variabilidade espacial pode expressar-se de forma isotrópica e anisotrópica. Sendo a última, negligenciada nas pesquisas relacio
Rev. Ciênc. Agron.. Publicado em: 04/11/2019
-
4. EFFECTS OF SIZE AND SAMPLING GRID ON THE QUALITY OF APPARENT SOIL ELECTRICAL CONDUCTIVITY MAPS
ABSTRACT The apparent soil electrical conductivity (ECa) is an attribute commonly used for the characterization of the spatial variability of soil, but its determination by handheld sensors consumes considerable time and labor. The reduction in the number of sampling points allows minimize them but can result in increased uncertainty of interpolated maps. Th
Eng. Agríc.. Publicado em: 09/09/2019
-
5. DELINEATION OF HOMOGENEOUS ZONES BASED ON GEOSTATISTICAL MODELS ROBUST TO OUTLIERS
RESUMO Diversas pesquisas utilizam medidas de condutividade elétrica aparente do solo (CEa) como indicador da variabilidade espacial de atributos físico-químicos existentes no campo de produção. Com base nestas medidas, zonas de manejo (ZM) são delineadas para aperfeiçoamento da gestão agrícola. Entretanto, estas amostras têm apresentado presença
Rev. Caatinga. Publicado em: 18/07/2019
-
6. SPATIALIZATION OF ELECTRICAL CONDUCTIVITY AND PHYSICAL HYDRAULIC PARAMETERS OF SOILS UNDER DIFFERENT USES IN AN ALLUVIAL VALLEY
RESUMO A caracterização da estrutura de variabilidade espacial de propriedades hidráulicas e da salinidade do solo é de grande importância para um adequado manejo agrícola de vales aluviais e para proteção da vegetação ciliar. Dessa forma, o objetivo deste trabalho foi a verificação da precisão de medições indiretas da condutividade elétrica
Rev. Caatinga. Publicado em: 09/05/2019
-
7. Precision production environments for sugarcane fields
ABSTRACT: Sugarcane (saccharum spp.) in Brazil is managed on the basis of “production environments”. These “production environments” are used for many purposes, such as variety allocation, application of fertilizers and definition of the planting and harvesting periods. A quality classification is essential to ensure high economic returns. However, t
Sci. agric. (Piracicaba, Braz.). Publicado em: 2019-02
-
8. Spatial soil sampling design using apparent soil electrical conductivity measurements
ABSTRACT Soil sampling is an important stage of digital soil mapping. The objective of this study was to characterize the spatial design of soil sampling using soil apparent electrical conductivity (ECa) and its optimized spatial sampling. For the characterization, it was used the Spatial Simulated Annealing (SSA) technique, incorporated on the software SANO
Bragantia. Publicado em: 29/09/2016
-
9. CORRELACIÓN ESPACIAL ENTRE MALAS HIERBAS EN UNA PRADERA Y SU RELACIÓN CON LA CONDUCTIVIDAD ELÉCTRICA APARENTE DEL SUELO (CE A )
ABSTRACT The objective of this study was to evaluate the ecology and, linear and spatial correlation between weeds in and soil apparent electrical conductivity (ECa, mS m-1) in a grassland. Measurements were done in 23/06/2008 (ECa) and 24/06/2008 (weeds). Data were analyzed using classical statistical and geostatistical tools. Most data presented logarithmi
Planta daninha. Publicado em: 2015-12
-
10. Estudo morfológico e hidroquímico de pequenas depressões na Nhecolândia, Pantanal, MS / Morphological and hydrochemical study of small depressions in Nhecolândia, Pantanal, MS
The southern part of the Taquari alluvial fan, called Nhecolândia, is a sub-region of the Pantanal of Mato-Grosso exhibiting a complex of round shape lakes, draining fields, forested sandy areas, small watercourses and small depressions. Former studies have shown that the sub-superficial water fluxes depend on the intensity of the flood and on the presence
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
-
11. Definition of management zones in coffee production fields based on apparent soil electrical conductivity
Fertilizer application at variable rates requires dense sampling to determine the resulting field spatial variability. Defining management zones is a technique that facilitates the variable-rate application of agricultural inputs. The apparent electrical conductivity of the soil is an important factor in explaining the variability of soil physical-chemical p
Scientia Agricola. Publicado em: 2012-06
-
12. Variabilidade espacial da produtividade de soja e dos atributos do solo em sistema de plantio direto sob rotação de culturas / Spatial variability of soybean yield and soil properties in a no-tillage in the crop rotation
Os objetivos deste trabalho foram analisar a variabilidade espacial dos atributos do solo em um sistema de produção agrícola, analisar a variabilidade espacial e temporal da produtividade e sua correlação com os atributos do solo e estudar a influência de diferentes grades amostrais na modelagem da dependência espacial dos atributos do solo. A coleta
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011