Abstract
IN 1960, I reported that water-logging reduced the size of the leaf lamina in upland rice variety Kindinga and that no such reduction occurred in swamp rice variety Dima, when grown under the same soil conditions. If the length of a leaf lamina depends on the length of its leaf sheath a reduction in the length of the latter will also lead to a consequent reduction in the length of the former. If this proposition holds true, the reduction in size of leaf lamina in upland rice variety due to water-logging can, therefore, be attributed to its similar effect on the length of the leaf sheath especially as the width of leaf lamina is not increased by this condition.
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