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Abstract

Rice plants were grown using nutrient film technique (NFT) to evaluate the effect of intermittent drought stress in terms of solar radiation (0.60 MJm-2) received by the plant and electrical conductivity (EC) of nutrient solution on nutrient uptake by different parts of plant. Water stress and solution EC had significant effect (P<0.05) on nutrient uptake but their interaction effect was not significant. In whole plant, irrespective of water stress and solution EC, the nutrient (P, K and Mg) uptake gradually increased reaching maximum at the final harvest but N and Ca decreased at the final harvest. Plants grown in the EC 3.0 solution had a significant (P<0.01) increased in the amount of N, P, K, Ca and Mg than EC 2.0. The same trend also observed in leaves and stems. In roots, water stress decreased the uptake of N and K at DATI (days after treatment imposed) 15 and 30 and; Mg at DATI 15. Water stress had no significant effect on P uptake. There was no consistent trend on uptake of Ca. Plants grown in EC 3.0 solution had significantly (P<0.05) greater P uptake at DATI 0 and 30, Mg at DATI 0 and 15 and; K at all the sampling dates. The uptake of N increased in EC 2.0 plants at DATI 45. In panicles, regardless of water stress and solution EC, the uptake of nutrients increased from flowering to final harvest.

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