Abstract

GUERRERO-GUTIERREZ, Jheison A.  and  TORRES, Enrique A.. Bean (Phaseolus vulgaris) basal crop coefficient (K _cb ) adjusted by remote sensing. rev.udcaactual.divulg.cient. [online]. 2022, vol.25, n.2, e1832.  Epub Dec 15, 2022. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v25.n2.2022.1832.

To carry out efficient water management in agriculture, it is necessary to know the water requirements of the crop, which can be done easily and quickly with the help of conventional cameras. In this study, the water requirements of a bean crop (DIACOL CALIMA G4494 variety) planted in CIAT, Palmira - Valle del Cauca, Colombia, were determined by estimating the curve of the basal crop coefficient (Kcb) derived from the vegetation cover fraction curve (Fcv). To determine the vegetation cover fraction curve, images taken with a digital camera in the visible spectrum (RGB) at low height (less than 3m) were used. The water needs of the bean crop were calculated using the basal crop coefficient values derived together with the FAO-56 modelling. The results indicate that the Kcb curve adjusted by photography was different from the standard curve presented in the publication FAO-56 for beans, mainly showing a difference in the duration of the stages and the Kcb values in these stages. Regarding water needs, when using the Kcb curve adjusted by photographs, it is evident that the crop requires more water in the middle and final stages, to avoid water stress in the plants.

Keywords : Evapotranspiration; FAO-56; Plant cover fraction; Water requirements of crops; Remote sensing.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )