ANDRADE JÚNIOR, Aderson S.; SILVA, Cláudio R.; DANIEL, Rossini.; CAVALCANTE, Rogério Farias.; F. JÚNIOR, Luiz G. M.; SOUZA, Claudinei F.
Resumo:
Capacitance sensors are alternatives to most common methods of quantitative
measurement of soil water content, providing readings safely and rapidly with depth. In this study, a
capacitance probe (Diviner 2000®) was calibrated for a Yellow Latosol, located in experimental area
of the Embrapa Meio-Norte, at the Parnaíba county, Piauí State, Brazil. Six access tubes were installed
in a 5 by 2 m grid system. Three moisture levels (wet, moist and dry) were applied in two replications.
Were made readings of device for every 0.1 m until 1.0 m depth as well as collecting of soil samples
to determine volumetric soil water content. The calibration equation, derived by regression analysis,
was significantly (p<0.001) related with measurements of equipment with high correlation (R2 =0.971)
and lower standard error (0.01 m3 m-3). Manufacture’s calibration presents in Diviner 2000® is suitable
for this soil.
