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\section{Hetereogeneity in LR traits}  Foraging for nutrients is a major function for lateral roots.  \subsection{Plasticity} \subsection{Plasticity to nutrients}  As soil environments change, plant root systems can modify their growth and development according to the nutrient distribution. Different strategies may be required for acquisition of different resources, depending on their distribution in the soil.  \subsubsection{The Drew scheme}  \subsection{Stochastic variability}