Temporal Phosphorus Allocation and Resorption Plasticity Drive Interspecific Phosphorus‐Use Efficiency in Rice‐Rapeseed Rotations

and metabolic-P above photosynthetic thresholds and confined P resorption to a short senescence phase (c. 12.5% of lifespan). Under P deficiency, rapeseed enhanced phospholipids replacement and accelerated P resorbed from nucleic acid and metabolic-P pools, while rice maintained high P resorption via simultaneous degradation of phospholipids and nucleic acids. These findings demonstrate that a higher inorganic/organic P ratio and prolonged internal P recycling underlie enhanced PUE, offering insights into optimising crop selection and precision P management in sustainable cropping systems.