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- Dynamics of nitrogen between organic and inorganic phases in soil
- Effect of nitrification inhibitors on nitrogen transformation rates in the soil-plant system.
- Efficiency of nitrogen fertilization of dry-seeded rice in south-east Australia.
- Interactions between soil and fertilizer nitrogen.
- Nitrogen transformations in soils during nitrification of alkaline-hydrolysing fertilizers.
- Nutrient cycling and grain legume nitrogen fixation in ameliorated sodic soils.
- Phillip Michael Chalk
- Reconciling legume effects on soil N and N of subsequent wheat with reference to the role of the nodulated root.
- The determination of nitrogen fixation and the effect of soil properties on fixation by Trifolium subterraneum L., Medicago truncatula Gaertn. and Acacia dealbata Link.
- The effects of phosphorus application rate and stocking rate on nitrogen fixation and nitrogen economy of dairy pastures.
- The measurement of N2 fixation by legumes and transfer of fixed N using 15N.