SOIL OXYGEN AND WATER RELATIONSHIPS TO RICE GROWTH

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Abstract
Colusa rice was grown under both non-flood conditions, where the soil oxygen was artificially modified, and under flooded conditions. Under flooded conditions, the roots were larger in diameter, straighter, and had fewer root hairs than those under non-flood conditions. The change in root morphology was not directly associated with soil oxygen. Roots grown under non-flood condition appeared to be less effective in allowing internal oxygen diffusion than those developed under flooding. Plants grown under flooded conditions produced better shoot growth than those under non-flood conditions. The increase in growth could not be associated with oxygen. Incidations were that the primary cause was soil-water content.

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