References

Further reading

* Raghothama, K. G. & Karthikeyan, A. S. (2005). "Phosphate acquisition", Plant and Soil 274: 37-49.
* Taylor, W. A. (1934). "Significance of extreme or intermittent conditions in distribution of species and management of natural resources, with a restatement of Liebig's Law of the minimum", Ecology 15: 374-379.
* Shelford, V. E. (1952). Paired factors and master factors in environmental relations. Illinois

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