Nitrogen nutrition of rice plants under salinity

Author： Abdelgadir E. Oka M. Fujiyama H.

ISSN： 0006-3134

Source： Biologia Plantarum, Vol.49, Iss.1, 2005-03, pp. : 99-104

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Abstract

Two rice (Oryza sativa L.) cultivars, Koshihikari and Pokkali, were grown in solution culture at three concentrations of NaCl or Na₂SO₄ [0 (S0), 50 (S1), and 100 (S2) mmol dm⁻³] and three N contents [0.7 (N1), 7 (N2) and 14 (N3) mmol dm⁻³]. Salinity significantly decreased dry matter of both cultivars. Pokkali had better growth than Koshihikari under both saline and non-saline conditions. Applications of N enhanced development of shoot dry mass under S0 and S1 treatments up to N2. Under S2, N application had no effect on shoot dry mass of both cultivars. Root dry mass of both cultivars decreased with increasing N application at S1 and S2. Shoot and root NO₃-N content in both rice cultivars increased with increasing N concentration in the nutrient solutions. The absorption of NO₃-N was less in Koshihikari than Pokkali plants, and also was much less in Cl⁻ than SO₄²⁻ salinity suggesting the antagonism between Cl⁻ and NO₃⁻. In addition a significant negative correlation between concentrations of NO₃-N and Cl⁻ in the shoots or roots was observed in both cultivars