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Soil biology
Roots
Soil fertility
Soil animals
Soil organic matter
Soil fungi
Soil bacteria
  

Rhizobia Specificity - Peas inoculated with their correct rhizobia (on the right) are green and show no symtoms of nitrogen deficiency. The plants on the left were inoculated with lupin root nodule bacteria, which cannot nodulate the peas. The plants in the centre were inoculated with clover rhizobia which are also unable to nodulate peas.