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vol.64 número1EVALUACIÓN DE LA ÉPOCA DE CORTE DE TRITICALE (X Triticosecale Wittmack) PARA ENSILAJEDISPONIBILIDAD DEL FÓSFORO EN SUELOS ÁCIDOS DE MISIONES, ARGENTINA índice de autoresíndice de materiabúsqueda de artículos
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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

ORTEGA-FARIAS, Samuel; CALDERON, Rodrigo; MARTELLI, Nelson  y  ANTONIOLETTI, Rodrigo. Evaluation of a model for predicting net radiation over an industrial tomato crop. Agric. Téc. [online]. 2004, vol.64, n.1, pp.41-49. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072004000100005.

A study was carried out in order to evaluated a model that estimates the net radiation (Rn) flux over a tomato crop (Lycopersicon esculentum Mill.) cv. Heinz 2150, under clear and cloudy conditions. For that purpose, an automatic meteorological station (EMA) was installed in the central part of the crop, located in the Panguilemo Experimental Station of the Faculty of Agronomy of the University of Talca (35º23’ S lat, 71°40’ W long, 110.5 m.o.s.l.). The EMA measured solar radiation, air temperature, relative humidity and vapor pressure at 20-min time intervals. Results indicated that the model was able to estimate the net radiation fluxes at 20-min time intervals with a standard error of estimate (DEE) of 34 W m-2 and absolute error (Ea) less than 3.2%. On a daily basis, the model estimated the Rn with a DEE and an Ea of 0.6 MJ m-2 d-1 (0.24 mm d-1) and 4.1% , respectively.

Palabras clave : energy balance; water requirements; air emissivity; albedo; Lycopersicon esculentum.

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