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Acta Scientiarum. Agronomy

versão On-line ISSN 1807-8621

Resumo

SOUZA, Jorge Luiz Moretti de  e  GOMES, Siguifrid. Limitations in the use of a ten-day water balance model, based on available water capacity in the soil. Acta Sci., Agron. [online]. 2008, vol.30, n.2, pp.153-163. ISSN 1807-8621.  http://dx.doi.org/10.4025/actasciagron.v30i2.1721.

The objective of this work was to evaluate the limitations of a ten-day climatic water balance model to simulate irrigation in four different Paraná State regions. Sixty-eight water balance scenarios were tested to allow the relationship among crop evapotranspiration (ETc), probable precipitation at 75% level (P75%), soil available water capacity (AWC) and annual water deficiency (DEF). The results showed that: the model estimates its components better for greater values of available water (AW) in the soil; the ideal AWC value to process the irrigation analyses based on variations of ETo, Kc and ETc should be established in the model itself. However, if the condition "larger ten-day ETo < AW" of the period is valid, the water balance produces consistent results for 10 days periodicity.

Palavras-chave : simulation; AWC; available water; irrigation; agricultural irrigation.

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