Water and Nitrogen Uptake in Upland and Swamp Rice

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Abstract
The water uptake per unit dry matter and nitrogen uptake per unit water absorbed of swamp rice (Dima) and upland rice (Kindinga) at three nitrogen levels equivalent to 23.6, 70.8, and 118, kg./ha. (20, 60 and 100 lb./acre) respectively were studied under tropical green-house conditions in Trinidad. The water uptake per unit dry matter produced was significantly greater in Kindinga than in Dima at the three nitrogen levels. Additional nitrogen increased the water requirement of Kindinga but decreased that of Dima, the greater increase in Kindinga being attributed to increase in leaf area. The efficiency of nitrogen absorption in terms of water transpired was greater in Dima than in Kindinga at the three nitrogen levels.

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