其他摘要：The nutrient uptake by roots of crops through a moving boundary model is studied. Solutions through the integral balance method are obtained. Also, a solution through the front-fixing method and the application of finite difference method in his versions explicit up wind and full implicit is obtained. Both solutions are implemented in Fortran algorithms which are applied for to compute the K, Mg and P uptake by seedlings pine. The results of both calculus are compared with ex:perimental results as with predictions of other models based in fixed domains
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