SOUZA, José Leonaldo de.; TEODORO, Iêdo.; ENDRES, Laurício.; MOURA FILHO, Gilson.; BRITO, José Edmilson Deodado de.; FERREIRA JUNIOR, Ricardo A.; ALMEIDA, Alexsandro C. S.
Résumé:
The objective of this study is to show volumetric (m3 m-3) soil moisture changes
using observations made by automatic sensors water content reflectometer with and without
calibration for a bean crop seeded under 3 different soil cover situations: So (bare soil), S1
(vegetal straw), S2 (plastic bags) and different water regimens in a factorial experiment. The
observed distributions indicated the need of calibration with the local soil data. Volumetric soil
moisture changed between 18.1%-18.5%, 16.5%-17.2% and 16.4%-18.8% for So, S1 and S2
situations, respectively. The changes in moisture amplitudes were 6.4%, 4.9% and
5.8%respectively. During the period of water stress, the suppression of watering for 8 days
(between days 37 to 51) showed a smaller moisture amplitude for straw S1 (0.7%) than of
situations S2 (1.9%) and So (7.4%) thus indications that the soil covers favor a less water loss
during the period that irrigation ceased.
