REFERENCES
- Andreeva , I. V. , Govorina , V. V. , Vinogradov , S. B. and Yagodin , B. A. 2001 . Nickel in plants . Agrokhimiya , 3 : 82 – 94 .
- Barker , A. V. 1989 . Genotypic response of vegetable crops to nitrogen nutrition . Horticultural Science , 24 : 584 – 591 .
- Bekkari , N. B. and Pizelle , G. 1992 . In vivo urease activity in Robinia Pseudoacacia . Plant Physiology and Biochemistry , 30 ( 2 ) : 187 – 192 .
- Brown , P. H. , Welch , R. M. and Cary , E. E. 1987a . Nickel: A micronutrient essential for higher plants . Plant Physiology , 85 : 801 – 803 .
- Brown , P. H. , Welch , R. M. , Cary , E. E. and Checkai , R. T. 1987b . Beneficial effects of nickel on plant growth . Journal of Plant Nutrition , 10 : 2125 – 2135 .
- Clarkson , D. T. and Luttge , U. 1989 . Divalent cations, transport and compartmentation . Progress in Botany , 51 : 93 – 112 .
- Dixon , N. E. , Gazzola , C. , Blakeley , R. L. and Zerner , B. 1975 . Jack bean urease (EC 3.5.1.5.). A metalloenzyme. A simple biological role for nickel . Journal of the American Chemical Society , 97 : 4131 – 4133 .
- Eskew , D. L. , Welch , R. M. and Norvall , W. A. 1984 . Nickel in higher plants. Further evidence for an essential role . Plant Physiology , 76 : 691 – 693 .
- Gerendas , J. and Sattelmacher , B. 1997 . Significance of Ni supply for growth, urease activity and the concentrations of urea, amino acids and mineral nutrients for urea-grown plants . Plant and Soil , 190 : 153 – 162 .
- Gerendas , J. and Sattelmacher , B. 1999 . Influence of Ni supply on growth and nitrogen metabolism of Brassica napus L. growth with NH4NO3 or urea as N source . Annals of Botany , 83 : 65 – 71 .
- Hogan , M. E. , Swift , I. E. and Done , J. 1983 . Urease assay and ammonia release from leaf tissue . Phytochemistry , 22 ( 3 ) : 663 – 667 .
- Izosimova , A. 2005 . Modelling the Interaction between Calcium and Nickel in the Soil-Plant System , Braunschweig, , Germany : FAL Agricultural Research .
- Kabata-Pendias , A. 2001 . Trace Elements in Soils and Plants , Boca Raton, FL : CRC Press .
- Krogmeier , M. J. , McCarty , G. W. and Bremner , J. M. 1989 . Phytotoxicity of foliar applied urea . Proceedings of the National Academy of Sciences USA , 98 : 8189 – 8191 .
- Krogmeier , M. J. , McCarty , G. W. , Shogren , D. R. and Bremner , J. M. 1991 . Effect of nickel deficiency in soybeans on the phytotoxicity of foliar applied urea . Plant and Soil , 135 : 283 – 286 .
- Malakouti , M. J. 2004 . Fertilizer Use by Crop in Iran , Tehran, , Iran : Soil and Water Research Institute, Ministry of Agriculture .
- Marschner , H. 1995 . Mineral Nutrition of Higher Plants , New York : Academic Press .
- Mengel , K. and Kirkby , E. 2001 . Principles of Plant Nutrition , Dordrecht, , The Netherlands : Kluwer .
- Minotti , P. L. , Halseth , D. E. and Sieczka , J. B. 1994 . Field chlorophyll measurement to assess the nitrogen status of potato varieties . Horticultural Science , 29 : 1497 – 1500 .
- Morrison , R. , Brooks , R. and Reeves , R. 1980 . Nickel uptake by Alyssum species . Plant Science Letters , 17 : 451 – 460 .
- Ovcharenko , M. 1997 . Heavy Metals in the Soil-Plant Fertilizer System , Moscow : Proletarskij Svetoch .
- Polacco , J. C. and Havir , E. A. 1979 . Comparison of soybean urease isolated from seed and tissue culture . Journal of Biological Chemistry , 254 : 1707 – 1715 .
- Polacco , J. C. and Holland , M. A. 1993 . Roles of urease in plants cell . International Review of Cytology , 145 : 65 – 103 .
- Reinbothe , H. and Mothes , K. 1962 . Urea, ureides and guanidines in plants . Annual Review of Plant Physiology , 13 : 129 – 150 .
- Singh , B. , Dang , Y. and Mehta , S. 1990 . Influence of nitrogen on the behavior of nickel in wheat . Plant and Soil. , 127 : 213 – 218 .
- Stebbins , N. , Hollands , M. A. , Cianzio , S. R. and Polacco , J. C. 1991 . Genetic tests of the roles of the embryonic urease of soybean . Plant Physiology , 97 : 1004 – 1012 .
- Tan , X.vW. , Ikeda , H. and Oda , M. 2000 . Effect of nickel concentration in the nutrient solution on the nitrogen assimilation and growth of tomato seedling in hydroponic culture supplied with urea or nitrate as the sole nitrogen source . Scientia Horticulturae , 84 : 265 – 273 .
- Vavrina , C. S. and Obreza , T. A. 1993 . Response of chinese cabbage to nitrogen rate and source in sequential plantings . Horticultural Science , 28 : 1164 – 1165 .
- Walker , C. D. , Graham , R. D. , Madison , J. T. , Cary , E. E. and Welch , R. M. 1985 . Effects of Ni deficiency on some nitrogen metabolites in cowpeas (Vigna unguiculata L. Walp) . Plant Physiology , 79 : 474 – 479 .
- Witte , C. P. , Tiller , S. A. , Taylor , M. A. and Davies , H. V. 2002 . Leaf urea metabolism in potato. Urease activity profile and patterns of recovery and distribution of 15N after foliar urea application in wild-type and urease- antisense transgenics . Plant Physiology , 128 : 1129 – 1136 .