Resumo

FARIA, Roberto Araújo de; SOARES, Antônio Alves; SEDIYAMA, Gilberto C.  e  RIBEIRO, Carlos Antônio Álvares Soares. Demand of supplemental irrigation for corn in the state of Minas Gerais, Brazil. Rev. bras. eng. agríc. ambient. [online]. 2000, vol.4, n.1, pp. 46-50. ISSN 1415-4366.  http://dx.doi.org/10.1590/S1415-43662000000100009.

Using a soil water balance model and a geographical information system, the daily maximum demand of supplemental irrigation for corn in the state of Minas Gerais was simulated and spacialized, for coarse (total available water - TAW: 0.6 mm cm^-1), medium (TAW = 1.2 mm cm^-1) and fine (TAW = 1.8 mm cm^-1) soils. The daily dependable precipitations were estimated using the gamma distribution at 75% of probability and the daily evapotranspiration was computed using the Penman-Monteith (Smith, 1991) with 50% probability. The best planting date considering the lower supplemental irrigation demand was spacialized.

Palavras-chave : Zea mays L.; supplemental irrigation; GIS.