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REFERENCES

  • Blair, G. J., Miller, M. H. & Mitchell, W. A. (1970). Nitrate and ammonium sources of nitrogen for corn and their influence on the intake of other ions. Agronomy Journal, 64, 530532.
  • Cox, W. J. & Reisenauer, H. M. (1973). Growth and ion uptake by wheat supplied nitrogen as nitrate, or ammonium, or both. Plant and Soil, 38, 363380.
  • Duke, S. H., Friedrich, J. W., Schrader, L. E. & Koukkari, W. L. (1978). Oscillations in the activities of enzymes of nitrate reduction and ammonia assimilation in Glycine max and Zea mays. Physiologia Plantarum, 42, 269276.
  • Faust, H. (1967). Probenchemie 15N-markierter Stickstoffverbindungen im Mikro-bis-Nanomolbereich für die emissionsspektrometrische Isotopenanalyse. hotopenpraxis, 3, 100.
  • Frith, G. J. T. (1972). Effect of ammonium nutrition on the activity of nitrate reductase in roots of apple seedlings. Plant and Cell Physiology, 13, 10851090.
  • Good, N. E. (1960). Activation of the Hill Reaction by amines. Biochimica et Biophysica Acta, 40, 502517.
  • Hewitt, E. J. (1966). Sand and Water Culture Methods Used in the Study of Plant Nutrition. Technical Communication No. 22 (revised), Commonwealth Bureaux of Horticultural and Plantation Crops.
  • Ivanko, S. & Ingverson, J. (1971). Investigation on the assimilation of nitrogen by maize roots and the transport of some major nitrogen compounds by xylem sap. III. Transport of nitrogen compounds by xylem sap. Physiologia Plantarum, 24, 355362.
  • Kaiser, J. J. & Lewis, O. A. M. (1984). Nitrate reductase and glutamine synthetase activity in leaves and roots of nitrate-fed Helianthus annum L. Plant and Soil, 70, 127130.
  • Koster, A. L. (1963). Changes in the metabolism of isolated root systems of soy bean. Nature, 198, 709710.
  • Lewis, O. A. M. & Chadwick, S. (1983). A 16N investigation into nitrogen assimilation in hydroponically-grown barley (Hordeum vulgare L. cv. Clipper) in response to nitrate, ammonium and mixed nitrate and ammonium nutrition. New Phytologist, 95, 635646.
  • Lewis, O. A. M., James, D. M. & Hewitt, E. J. (1982). Nitrogen assimilation in barley (Hordeum vulgare L. cv. Mazurka) in response to nitrate and ammonium nutrition. Annals of Botany, 49, 3949.
  • Mehta, P. & Strivastava, H. S. (1982). Increase in vivo nitrate reductase activity in maize leaves in the presence of ammonium. Biochimica et Biophysica der Pflanzen, 177, 237243.
  • Mengel, K., Robin, P. & Salsac, L. (1983). Nitrate reductase activity in shoots and roots of maize seedlings as affected by the form of nitrogen nutrition and the pH of the nutrient solution. Plant Physiology, 71, 618622.
  • Murphy, A. T. (1984). A16N study of the effects of nitrate, ammonium and nitrate + ammonium nutrition on nitrogen assimilation in Zea mays L. M.Sc. thesis, University of Cape Town.
  • Oaks, A., Aslam, M. & Bossel, I. (1977). Ammonium and amino acids as regulators of nitrate reductase in corn roots. Plant Physiology, 59, 391394.
  • Pate, J. S. & Wallace, W. (1964). Movement of assimilated nitrogen from the root system of the field pea (Pisum arvense L.). Annals of Botany, 28, 8399.
  • Schrader, L. E., Domska, D., Jung, Jr, P. E. & Peterson, L. E. (1972). Uptake and assimilation of ammonium-N and nitrate-N and their influence on the growth of corn (Zea mays L.). Agronomy Journal, 64, 690695.
  • Schrader, L. E., Cataldo, D. A. & Peterson, D. M. (1974). Use of protein in extraction and stabilization of nitrate reductase. Plant Physiology, 53, 688690.
  • Smith, F. W. & Thompson, J. F. (1971). Regulation of nitrate reductase in excised barley roots. Plant Physiology, 48, 219223.
  • Smith, G. S., Johnston, C. M. & Cornforth, I. S. (1983). Comparison of nutrient solutions for growth of plants in sand culture. New Phytologist, 94, 537548.
  • Soares, M. I. M. & Lewis, O. A. M. (1986). An investigation into nitrogen assimilation and distribution in fruiting plants of barley (Hordeum vulgare L. cv. Clipper) in response to nitrate, ammonium and mixed nitrate & ammonium nutrition. New Phytologist, 104, 385393.
  • Wallace, W. (1975). A re-evaluation of the nitrate reductase content of maize root. Plant Physiology, 55, 774777.
  • Warncke, D. D. & Barber, S. A. (1973). Ammonium and nitrate uptake by corn (Zea mays L.) as influenced by nitrogen concentration and NH4+/NO3 ratio. Agronomy Journal, 65, 950953.