Fig. S1 Light micrographs of cowpea roots grown in mannitol or mixed salts.

Fig. S2 Effects of solution composition on elongation rate of cowpea roots at constant osmolarity of c. 150 mOsM.

Fig. S3 Modelled effects of Mg, Na or K on the Ca concentration required to avoid Ca deficiency.

Figs S4–S5 Re-analysis of published Ca deficiency data.

Tables S1–S7 Compositions of solutions used in Expts 1–7

Notes S1 Re-examination of published data on salinity-induced Ca deficiency.

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