Discussing soil constraints which influence N fixation. That would include things like pH and N levels which have direct effects, salinity and chloride, which may have direct affects, but which also affect the growth of the legume (and this may differ between different legume species), other nutrition constraints (like boron toxicity, Mo deficiency, S and P deficiency, as examples) which may affect both plant growth, and the ability of the plant/rhizobia combination to fix N. There is a big list of possible issues (waterlogging, disease (eg root lesion nematode or fungal diseases), high bulk density) so pick the ones you feel are important (and focus on issues relevant to Saudi if you want – that will help when you go home).
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