Spatial soil sampling design using apparent soil electrical conductivity measurements
AUTOR(ES)
Siqueira, Glécio Machado, Dafonte, Jorge Dafonte, González, Antonio Paz, Vázquez, Eva Vidal, Armesto, Monteserrat Valcarcel, Guedes Filho, Osvaldo
FONTE
Bragantia
DATA DE PUBLICAÇÃO
29/09/2016
RESUMO
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 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.
Documentos Relacionados
- EFFECTS OF SIZE AND SAMPLING GRID ON THE QUALITY OF APPARENT SOIL ELECTRICAL CONDUCTIVITY MAPS
- SPATIAL VARIABILITY OF SOIL APPARENT ELECTRICAL CONDUCTIVITY - EFFECT OF THE NUMBER OF SUBSAMPLES
- Spatial and temporal variability of soil electrical conductivity related to soil moisture
- Definition of management zones in coffee production fields based on apparent soil electrical conductivity
- Watermelon fertigation with electrical conductivity and ph monitoring in the soil solution