SILVA, Cláudio R.; ANDRADE JÚNIOR, Aderson S.; MELO, Francisco B.; SOUSA, Antonio B.; SOUZA, Claudinei F.
Résumé:
Capacitance sensors are alternatives to most common soil water content methods,
providing readings safely and rapidly with depth. In this study, a capacitance probe (Diviner 2000®)
was calibrated in a Red Yellow Argisoll at Experimental area of Embrapa Meio-Norte, Teresina, Piaui
State, Brazil. Six access tubes were installed in a 5 by 2 m grid system. Three moisture levels (dry,
moist and satured soil) were applied in two replications. Readings of device were made for every 0.1
m until 1.0 m depth as well as collecting of soil samples to determine the volumetric soil water ( v).
The calibration equation, derived by regression analysis, was significantly related with measurements
of equipment with high correlation (R2 =0.93) and lower standard error (0.014 m3 m-3). Despite
underestimating values of v by 9.2%, the manufacture’s calibration presents in Diviner 2000® is
acceptable for this soil.
