1. Chemical analysis.-;Allen,1986
2. Growth response of Vigna ambacensis L. seedlings to the interaction between nitrogen source and salt stress.-Pakistan;Alyemeni;J. Bot,1997
3. Corn responses to ammonium-and nitrate-nitrogen fertilization.-Soil;Barber;Sci. Soc,1992
4. Cation and NO3 - accumulation in pea and cucumber as influenced by N nutrition;Barker;J. amer. Soc. hort. Sci,1972
5. Growth and composition of tomato as affected by source of nitrogen and biocides