4.1 Article

SPATIAL VARIABILITY OF SOIL APPARENT ELECTRICAL CONDUCTIVITY - EFFECT OF THE NUMBER OF SUBSAMPLES

Journal

ENGENHARIA AGRICOLA
Volume 41, Issue 3, Pages 396-401

Publisher

SOC BRASIL ENGENHARIA AGRICOLA
DOI: 10.1590/1809-4430-Eng.Agric.v41n3p396-401/2021

Keywords

Kriging; Soil sampling; Spatial variability pattern; Soil sensors

Funding

  1. National Council for Scientific and Technological Development
  2. Coordination for the Improvement of Higher Education Personnel
  3. Research Support Foundation of the State of Minas Gerais

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This study investigated the influence of ECa readings per sample point on semivariance and kriging analysis. The results showed that the number of readings per sample point significantly affects ECa maps, and reducing readings per sample point can increase prediction errors by kriging. Therefore, ECa maps determined with the highest readings per sampling point were found to be the most accurate.
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 ECa maps. Therefore, this study verified the influence of ECa readings per sample point on the semivariance and kriging analysis. The data were collected from an area (2.5 ha) of coffee plants. One hundred sampling points were measured considering 20 readings each. 1, 5, 10, 15, and 20 sample point readings were tested. The influence of the number of readings per sampling point on the ECa mapping was determined using linear regression analysis at a significance level of 5%. The results obtained showed that ECa readings per sampling point significantly influence ECa maps. In addition, they demonstrated that reducing the number of readings per sampling point increases prediction errors by kriging. Thus, ECa maps determined with the highest readings per sampling point were mostly accurate.

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