1. Abdalla MI, Abdalla MMA, Abdel-Aal SA, Farrag IA (1998) Effect of nitrogen fertilization on the yield and quality of some salad crops. Hortsci Abstr 33:2
2. Addiscott TM, Benjamin N (2004) Nitrate and human health. Soil Use Manag 20:98–104
3. Addiscott TM, Whitmore AP, Powlson DS (1991) Farming, fertilizers and the nitrate problem. CAB, Wallingford
4. Andersen L, Nielsen NE (1992) A new cultivation method for the production of vegetables with low content of nitrate. Sci Hortic 49:167–171
5. Andrews M (1986) The partitioning of nitrate assimilation between root and shoot of higher plants: mini review. Plant Cell Environ 9:511–519