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

journal contribution
posted on 2023-06-08, 11:29 authored by M Aslam, Tim Flowers, R H Qureshi, A R Yeo
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)).

History

Publication status

  • Published

Journal

Journal of Agronomy and Crop Science

ISSN

0931-2250

Publisher

Blackwell Publishing

Issue

4

Volume

176

Page range

249-258

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-05-22

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