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A Iysimeter experiment was conducted at the Mapalana Research Farm in order to estimate the evapotranspiration (ET) demand of rice in the southern w e t zone. The measured values of ET were compared with pan evaporation (EP). The impact of meteorological factors on ET and EP of rice fields were assessed by the multiple regression method. The ET rate of rice varied in the range o f 215 mm/day. The ET/EP ratio was almost one at transplanting reaching 1.9 at-heading stage. The average ET/EP ratio for the entire growth period was 1.39. It was revealed that wind is the most decisive factor governing ET and EP from rice fields.

Evapotranspiration requirement of rice at Mapalana in the wet zone of southern Sri Lanka