RT Journal Article
T1 Spatial soil sampling design using apparent soil electrical conductivity measurements
A1 Siqueira, Glécio Machado
A1 Dafonte Dafonte, Jorge
A1 Paz González, Antonio
A1 Vidal Vázquez, Eva
A1 Valcárcel-Armesto, Montserrat
A1 Guedes Filho, Osvaldo
K1 Geostatistics
K1 Semivariogram
K1 Spatial variability
K1 Optimization
K1 Soil sampling
AB 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 SANOS 0.1, and the method of response surface sampling design on the software ESAP 2.35. The ECa was measured at 1,887 points in an area of 6 ha located in the northwestern region of Spain. The EM38-DD equipment (Geonics Limited 2005) was used at 2 depths: vertical dipole (1.5 m effective measurement depth) and horizontal dipole (0.75 m effective measurement depth). Semivariogram showed trend for ECa in vertical dipole (ECa-V) and ECa in horizontal dipole (ECa-H). Software SANOS 0.1 and ESAP 2.35 were used to obtain the 40-point sampling scheme, using the 2 schemes (SANOS and ESAP). ECa-V estimation values at the 1,887 points were calculated with residual ordinary kriging. The sampling scheme obtained from ESAP was better than with SANOS
PB Instituto Agronômico de Campinas
SN 0006-8705
YR 2016
FD 2016-09-29
LK http://hdl.handle.net/10347/16248
UL http://hdl.handle.net/10347/16248
LA eng
NO Siqueira, Glécio Machado, Dafonte, Jorge Dafonte, González, Antonio Paz, Vázquez, Eva Vidal, Armesto, Monteserrat Valcarcel, & Guedes Filho, Osvaldo. (2016). Spatial soil sampling design using apparent soil electrical conductivity measurements. Bragantia, 75(4), 459-473. Epub September 29, 2016.https://dx.doi.org/10.1590/1678-4499.445
NO The authors are grateful to the Ministerio de AsuntosExteriores y de Cooperación (MAEC-AECID) from Spainfor the granting of scholarships for PhD studies. This workhas been funded by Ministerio de Educación y Ciencia(project CGL2005-08219-C02), by Xunta de Galicia(PGIDIT06PXIC291062PN), Spanish Ministry of Economyand Competitiveness (project CGL2013-47814-C2) and bythe European Regional Development Fund (ERDF)
DS Minerva
RD 24 abr 2026