Abstract
A new simplified mathematical model was introduced to assess the rate of oxygen supply to plant roots, and to evaluate separately the longitudinal flux through the aerenchymatous system and the transversal flux from the root medium. The parameters were derived from the experiemntal results with decapitated rice seedlings solution-cultured with aeration. With decreasing oxygen concentration in the root medium, the transversal oxygen flux decreased and the longitudinal flux increased so as to compensate for the decrease of the former, but in some older rice seedlings there was observed a growing insufficiency in oxygen supply to the roots.
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