Interaction of phosphate and salinity on the growth and yield of rice (Oryza sativa L)

Aslam, M, Flowers, T J, Qureshi, R H and Yeo, A R (1996) Interaction of phosphate and salinity on the growth and yield of rice (Oryza sativa L). Journal of Agronomy and Crop Science, 176 (4). pp. 249-258. ISSN 0931-2250

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The role of phosphorus application on growth and yield of rice under saline conditions was studied in a set of two experiments, one in nutrient and the other in soil culture. In experiment 1, the effect of inorganic phosphate (P-i) on the growth and ionic relations of four rice cultivars, varying in salt tolerance and phosphorus use efficiency, grown in nutrient solution with and without 50 mol m(-3) NaCl was measured in a 2 week trial. The growth of ail rice cultivars was affected to different degrees due to external P; in the presence of sale. External P-i concentration up to 100 mu M in the presence of NaCl caused stimulation of all growth parameters (shoot, root, tillering capacity), above this concentration P-i had an inhibitory effect. Salt-induced P toxicity was exhibited at a much lower P-i concentration (10 mu M) by the salt sensitive cultivar. Increasing the supply of phosphorus (from 1 to 100 mu M P-i) to the saline medium tended to decrease the concentrations of Na+ and Cl- in all cultivars except IR 1561. Shoot concentrations of these saline ions were much lower in the salt tolerant and moderately salt tolerant rice cultivars. Shoot P and Zn concentrations showed an increasing trend in the presence of external P-i and salt in the rooting medium but most strikingly P:Zn ratio was lower in salt tolerant and moderately salt tolerant cultivars. Significantly higher concentrations of Na+, P and Cl-, and lower concentrations of Zn, were determined in the shoots of salt sensitive cultivars when exposed to salt stress in the presence of P-i. Results were confirmed in naturally salt-affected soils of two different types (saline-sodic and saline) where paddy yield of NIAB 6 (salt tolerant) and IR 1561 (salt, sensitive) showed improvement through moderate phosphorus supply (18 kg P ha(-1)).

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Depositing User: Catrina Hey
Date Deposited: 22 May 2012 12:57
Last Modified: 06 Jul 2012 11:55
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