Abstract
Abstract A pot experiment, using sand and peat, was done to investigate the effect on cavity spot of carrots of replacing calcium by various cations, notably ammonium. Despite an average incidence of more than one lesion per carrot, and some highly significant effects on plant cation composition, no striking effects on cavity spot incidence were observed. In sand, the “normal complete nutrient”; treatment had the least cavity spot, but in peat there were no significant differences. The distribution of the disorder was very non‐random and consistent with the involvement of an infective agent. Peat became very compacted between roots at their points of contact, but there was no obvious increased incidence of lesions at these points. It is concluded that the correlation previously found between cavity spot and soil ammonium was not causal.
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