6Sobrado, M. A. (2000). Relation of water transport to leaf gas exchange properties in three mangrove species. Trees, 14 (5) :258 -262.
7Huang, Z. A. , Jiang, D. A. , Yang, Y. , Sun, J. W. , & Jin, S. H. (2004). Effects of nitrogen deficiency on gas exchange, chlorophyll fluorescence, and antioxidant enzymes in leaves of rice plants. Photosynthetica ,42 (3) :357 -364.
8Jenkins, P. D. , & Mahmood, S. (2003). Dry matter production and partitioning in potato plants subjected to combined deficiencies of ni- trogen, phosphorus and potassium. Annals of applied biology, 143 (2) :215 - 229.
