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This research study was performed to estimate the stocastic supplementary needs of sprinkler irrigation to be used on maize (Zea mayz L.) crop, in the agriecological regions of the State of Rio Grande do Sul, called Planalto Médio and Missões. A series of 10 years of dai ly meteorological data from the meteorological stations of Cruz Alta and Passo Fundo was used to simulate irrigation needs using a water balance model. The needs were simulated for the combination of diferent sites (agriecological region of Missões and Planalto Médio); sowing seasons (Sep 1, Sep 15, Oct 1, Oct 15, Nov 1, Nov 15, Dec 1, Dec 15); irrigation management levels (for 100, 90, 80, 70 and 60 % of the potential crop yields) and levels of risk (2, 5, 10, 15, 20, 25, 30, 35 and 40%). The results indicate that: the needs for supplementary irrigation are at their highest when sowing is performed on October 15, diminishes for sowing before and after this data, the lowest values being found for December 15; the suplementary irrigation requeriments are greater under the agriecological conditions of the Missões as compared with those of the Planalto Médio; the supplementary amounts of irrigation estimated increase as the level of r isk diminishes.

Análise probabilística das necessidades de irrigação suplementar no Rio Grande do Sul