Fig. 3.

Effects of nitrogen supplementation upon amino acid metabolism and protein synthesis, the TCA cycle and organic acid levels. Control basal nitrogen (58 kg N ha⁻¹). Level 1 50 kg N ha⁻¹ supplement (108 kg N ha⁻¹). Level 2 100 kg N ha⁻¹ supplement (158 kg N ha⁻¹). Level 3 150 kg N ha⁻¹ supplement (208 kg N ha⁻¹). Level 4 200 kg N ha⁻¹ supplement (258 kg N ha⁻¹). LC-MS data is expressed as the internal standard peak ratio, total protein data is expressed as a percentage of dry mass. Replication n3. Error bars represent the standard error