Comparative Growth-rates of Upland and Swamp Rice Varieties

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Abstract
The growth of swamp rice (Dima) and upland rice (Kindinga) was studied under tropical glass-house conditions in Trinidad. Kindinga ultimately attained greater dry weight and height than Dima but the total number of leaves and tillers per plant were greater in Dima than in Kindinga. Kindinga had a greater number of leaves, on the main shoot, than Dima. Growth curve of leaf-lamina area per plant was similar to that of leaf-lamina dry weight in both varieties but leaf area per unit dry weight of lamina and per plant were usually greater in Kindinga than in Dima. Over the whole period, the mean relative growth rate, leaf weight ratio were greater in Kindinga than in Dima but net assimilation rate was greater in Dima than in Kindinga. Total nitrogen content was greater in Dima than in Kindinga during the tillering period but later the reverse was the case. The rate of nitrogen absorption was high in both varieties during the tillering and reproductive phases. Split applications of nitrogenous fertilizer are therefore suggested. The rate of nitrogen absorption was, however, greater in Dima than in Kindinga during the tillering period and latter half of the reproductive phase.

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