Summary
In a factorial pot experiment on garden peas investigating the effect of growing medium, inoculation, nitrogen fertilisation and charcoal addition, shoot growth was significantly better in John Innes potting compost than in 50/50 peat/sand compost and when receiving nitrogen fertilisation but was depressed by the presence of wood charcoal.
In the peat/sand medium, root systems were smaller but carried more and larger nodules. The number of nodules was increased by inoculation but the addition of carbon decreased root size, nodule number and nodule size.
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Devonald, V.G. The effect of wood charcoal on the growth and nodulation of garden peas in pot culture. Plant Soil 66, 125–127 (1982). https://doi.org/10.1007/BF02203411
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DOI: https://doi.org/10.1007/BF02203411