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Changes in the chlorophyll (SPAD) of the leaf ranks 8 (A) and 10 (B) of oilseed rape in control plants (HS-HN), sulphate-limited plants (LS-HN), and in combined sulphate- and nitrate-limited plants (LS-LN) for 28 d of treatments. Vertical arrows indicate the date of the theoretical onset of leaf senescence as described in Materials and methods. HS-HN, black arrow; LS-HN, grey arrow; LS-LN, white arrow. Other details as for Fig. 1.
