Plant and Soil

, Volume 84, Issue 1, pp 23–27 | Cite as

Salinity changes of tidal irrigation water of mangrove swamp at Warri, Nigeria

  • L. I. Okafor
  • S. O. Olojede-Nelson


Salinity variations of the tidal water irrigating the rice fields at Warri mangrove swamp were studied for one calendar year. It was found that the mean pH is 7.24 for low tides and 7.14 for high tides, and pH is highest in July for both high and low tides. Sodium, calcium and magnesium, the major cationic constituents of the soluble salts in the saline tidal irrigation water, as well as potassium a minor ionic constituent were all found to be highest in June at both low and high tides. Also, both the Electrical Conductivity (EC) and the derived Sodium Adsorption Ration (SAR) were highest in June. Salinity at both high and low tides is highest in June but lowest in September for high tides and in October for low tides. The indications are that the adverse effects of salinity are largely responsible for the poor initial growth and survival of the rice variety MAS 2401 during early seedling stage. From salinity point of view, it would appear that October is the most favourable month to transplant rice at the Warri mangrove swamp.

Key words

Irrigation Salinity 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Bigger J W and Donald R N 1972 Irrigation under adverse conditions.In Physical Edaphology. Eds. S A Taylor and G L Ashcroft.Google Scholar
  2. 2.
    International Rice Research Institute 1968 Annual Report for 1967. The International Rice Research Institute, Los Banos, Philippines.Google Scholar
  3. 3.
    Jackson M L 1958 Soil Chemical Analysis. Prentice Hall, Englewood Cliffs, N.J.Google Scholar
  4. 4.
    Pearson G A 1961 The salt tolerance of rice. International Rice Comm. Newsletter. 10, 1–4.Google Scholar
  5. 5.
    Ponnamperuma F N 1964 Dynamic Aspects of flooded soils and the nutrition of the rice plant.In The Mineral Nutrition of the Rice Plant. John Hopkins Press, Baltimore, Maryland, U.S.A., pp 295–328.Google Scholar
  6. 6.
    Van Schilfgaarde J 1976 Water management and salinity, prognosis of salinity and alkalinity. F.A.O. Soil Bulletin 31, pp 53–67.Google Scholar
  7. 7.
    Van Schilfgaarde M, Bernsten L, Rhoades J D and Rawlins S L 1974 Irrigation management for salt control. J. Irrigation and Drainage. Div. ASCE, Proc. 100 (IR 3), 321–338.Google Scholar

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1985

Authors and Affiliations

  • L. I. Okafor
    • 1
  • S. O. Olojede-Nelson
    • 1
  1. 1.National Cereals Research InstituteIbadanNigeria

Personalised recommendations