Apparent soil electrical conductivity in two different soil types

Wilker Nunes Medeiros, Domingos Sárvio Magalhães Valente, Daniel Marçal de Queiroz, Francisco de Assis de Carvalho Pinto, Igor Rodrigues de Assis

Resumo


Mapping the apparent soil electrical conductivity (ECa) has become important for the characterization of the soil variability in precision agriculture systems. The problem regarding the use of this soil attribute is that ECa occurs due to the interaction of a large number of factors, difficulting interpret the causes of its variability. The objective of this work was to examine the relations between ECa and soil attributes in two fields presenting different soil textures. In each field, 50 sampling points were chosen using a path that presented a high variability of ECa obtained from a preliminary ECa map. At each sampling point, the ECa was measured in soil depths of 0-20, 0-40 and 0-60 cm. In addition, at each point, soil samples were collected for the determination of physical and chemical attributes in the laboratory. The ECa data obtained for different soil depths was very similar. A large number of significant correlations between ECa and the soil attributes were found. In one of the fields, there was no correlation between ECa and organic matter or between ECa and soil clay and sand content. However, a significant positive correlation was shown for the remaining phosphorus. In the other field the ECa had a significant positive correlation with clay content and a significant negative correlation with sand content. The results suggest that the mapping of apparent soil electrical conductivity does not replace traditional soil sampling, however, it can be used as information to delimit regions in a field that have similar soil attributes.


Palavras-chave


Precision agriculture; Management zones; Soil sampling

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Referências


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