This project investigates the general nutrient and specific nitrate guidelines for leafy vegetables aiming to address findings that these vegetables can potentially accumulate nitrate. The project has made a significant contribution to the understanding of the nutrition of leafy Asian vegetables in production, with a particular focus on nitrogen. To achieve this, the project determined some plant responses to fertiliser of a number of leafy vegetables grown in hydroponics. As part of the project, nutrient disorders have been documented as an aid to growers in the identification of plant symptoms.