Fig. 6. (a) Proline content or (b) titratable acidity in 10-day old fruit of tomato
cultivar Counter grown in nutrient solutions containing either low (N1) or high
(N2) nutrient concentration (controls), or after transfer of plants to lower (N2/1)
or higher (N1/2) nutrient concentration. Values shown are means of two
replicates S.D.