Grain nutrient concentration
was increased in the delayed sowing treatment. However,
the magnitude of reduction of these nutrients was highest
at [eCO2] in the delayed sowing treatment. Such a reduction in
the nutritive value of the wheat grain at [eCO2] is likely to have a
major impact on human nutrition. The strong positive correlation
between grain protein and S, Fe and Zn concentrations suggests
that any strategies developed to increase grain yield, will also have
to increase grain protein and micronutrient concentrations or at
least maintain them at present levels.