What do you see and when?
- Few or whitish nodules on legume roots
- Observed 12 weeks after germination to early spring.
What could this indicate?
Inadequate nodulation. There could be many reasons for poor nodulation including:
- Soil acidity and high soil aluminium.
- Insufficient rhizobia in the soil as a result of cropping for many years.
- Residual herbicide damage.
- Molybdenum deficiency.
- Sulphur deficiency.
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What test can I do to confirm?
- Inspect nodules. Look for many big pinkish coloured nodules rather than small white nodules.
- Conduct nodulation score.
- Examine cropping history as soil rhizobia declines after three years without a host.
- Tissue test clover leaves with reference to molybdenum.
- Test strips of sulphur and molybdenum fertiliser.
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