Uso da energia emitida, para detectar necessidade de irrigação em trigo, em condições de cerrado / Use of energy emission for detecting the necessity of irrigation in wheat in field conditions

AUTOR(ES)

Rubens Augusto Camargo Lamparelli

DATA DE PUBLICAÇÃO

1987

RESUMO

Through the utilization of plant parameters (radiometric canopy temperature - T_d, aerodynamic and canopy resistances) and meteorological data (air temperature - T_A , global net radiation - R_n, vapor pressure deficit in air - delta _e), which are components of the Index {CWSI), one tries to demonstrate the utility of this methodology to identify the plant water status and detect irrigation necessity. The objectives of this methodology were: a) to observe the T_d behaviour with irrigation levels; b) to verify cloud and wind influences in the T_d; c) to observe the index {CWSI) behaviour, as an indicative irrigation necessity. That experiment was carried out in the Centro de Pesquisas Agropecuárias dos Cerrados (CPAC) and consist of three parcels with the following treatments: a)daily irrigation; b) a unique irrigation (50th day after the seedling growth); c) two irrigations (50th and 60th days after seedling growth), in the booting period. At thirty-day intervals, which consisted the experiment, T_A, T_d, R_n, wind velocity, soil water potential data were daily collected at 09:45, 11:00, 13:00, 14:00, 15:00 and 16:00 hr. The plant parameters (leaf water potential - psiup_ F, leaf temperature - T_F and stomatal resistance - R_s) were daily collected. The results showed that, as the radiometric canopy temperature as the index CWSI had a behaviour according to the treatments verified through the psiup_F, T_F, R_s and psiup_s data. The wind influenee was only observed in radiometric canopy temperature and cloud appearing provoked changes.as in radiometric canopy temperature as in the index CWSI. It was only possible the qualitative analysis because of the small sensibility of some measure systems.

ASSUNTO(S)

umidade do solo meteorological parameters wind effects cloud cover irrigation canopies (vegetation) cobertura vegetal efeitos do vento irrigação trigo moisture content wheat parametros meteorológicos agronomia cerrado

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