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RICE IN SRI LANKA-Water Management

Total water requirement for lowland rice

Total water requirement for lowland rice increases with the age of rice crop and could be summarized as follows.

Water requirement (WR) per season = Sum of daily ET + Sum of daily S & P

S and P rates are highly variable between locations thus WR varies accordingly.

Experiments conducted under controlled situations at Agriculture Research Station, Mahailluppallama suggest the following total WR for the Maha season.

 Total water requirement for a rice crop at ARS, Mahailluppallama during Maha season

Soil type

Duration of the crop


3 month

4 month

RBE moderately drained

1057 mm