NITRATE ACCUMULATION AND METABOLISM IN LETTUCE CULTIVARS AS INFLUENCED BY AMMONIUM: NITRATE RATIO IN RECIRCULATING NUTRIENT SOLUTION

Article Id: ARCC3086 | Page : 219 - 225
Citation :- NITRATE ACCUMULATION AND METABOLISM IN LETTUCE CULTIVARS AS INFLUENCED BY AMMONIUM: NITRATE RATIO IN RECIRCULATING NUTRIENT SOLUTION.Indian Journal Of Agricultural Research.2001.(35):219 - 225
K.N. AI-Redhaiman
Address : Department of Horticulture and Forestry, College of Agriculture and Veterinary Medicine, King Saud University, Buraydah, Al-Qassim, Saudi Arabia

Abstract

Tissue NO 3 − concentrations in hydroponically-grown lettuce were reduced significantly with increasing NH 4 +: NO 3 − ratios in the nutrient solution. However, effects of mixed-Nitrogen nutrition on plant growth response varied considerably, depending on cultivar. With increasing solution NH 4 +: NO 3 − ratios up to 50:50 (in a 15.0 mM N solution), shoot NO 3 − concentrations in romaine lettuce at full head development were reduced by approximately 58% (52% on a fresh weight basis), while shoot dry weights increased by 46% (28% fresh weight). In butterhead cultivars, a solution NH 4 +: NO 3 − ratio of 50:50 decreased shoot NO 3 − concentrations by 58% (54% fresh weight basis), but shoot growth was also reduced by 9% (15% fresh weight basis).

Keywords

References

  1. AL-Redhaiman, K.N. (1999). J. King Saud Univ. Agric. Sci., 12: 143-156.
  2. Asher, c.J. and Edwards, D.G. (1983). In Encyclopedia of Plant Physiology, 15A, (Pirson, N.A. and Zimmermann, M.H. Ed). Springer-Verlag, Berlin.
  3. Bum, I,J. (1994). Ann. Bot., 74: 143-157.
  4. Cataldo, DA et al. (1975). Comm. Soil Sci. PI. Anal, 6: 71-80.
  5. Cawse, P.A. (1967). Analyst, 92: 3] 1-3]5.
  6. Ganmore-Newmann, R. and Kalkafi, U. (1980). Agron. J., 72: 758-761.
  7. Gaudreau, L etal. (1995). J.Pl. Nutri., 18: 437453.
  8. Gentry, LE. et al. (1989). J. Pl. Nutr., 12: 363 -373.
  9. Herberer, J. and Below, F.E. (1989). Ann. Bot., 63: 643-649.
  10. Hoagland, D.R. and Arnon, D. I. (1950). The water-cdture method for growing plants without soil. Calif Agr. Expt. St". Cir.347.
  11. !ked, H. and asawa, T. (1984). Proc. of the 6th International Congress on Soilless Culture, Luntem, The Netherlands, 39.
  12. Mackown, C.T. et al. (1982). PI. PhysioI., 69: 353-359.
  13. McElhannon, w.A. and Mills, H.A. (1978). Agron. J., 70: 1027-1032.
  14. Oaks, A. et al. (1979). Can. J. Bot., 57:1824-1829.
  15. Roorda Van Eysinga, J.P.N.L (1984). Fertilizer Res., 5: 149-156.
  16. SAS User's Guide in Statistics (1985). 5th ed. SAS Institute, Gary, NC.
  17. Smart, D.R. and Bloom, A. J. (1988). Oecologia., 76: 336-340.
  18. Van Der Boon, J. et al. (1990). J. Hart. SeL, 65:309-321.
  19. Vessey, J.K. eta/. (1990). J. Pl Nutr., 13: 95-116.

Global Footprints