Phosphorus Uptake from Soil by Lolium perenne During and After Severe Drought

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Abstract
Mature Lolium perenne plants grown in soil were subjected to gradually increasing drought, and their uptake of phosphorus was determined during and after the drought. Relatively mild drought (soil matric potentials -0.6 to -0.8 MPa) stopped phosphorus uptake, probably because phosphorus in the drying soil became unavailable. After drought, the rates of uptake of phosphorus and of applied 32P from rewetted soil were reduced. Some recovery in rate of phosphorus uptake occurred two to three weeks after rewetting. The reduction in 32P uptake following drought was approximately the same whether the plants were mycorrhizal or not. The control of the reduced uptake was located in the root.