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Pak. J. Bot., 40(4): 1601-1608, 2008. |
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Updated: 09-07-09 |
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INTERACTIVE EFFECT OF ROOTING MEDIUM APPLICATION OF PHOSPHORUS AND NACL ON PLANT BIOMASS AND MINERAL NUTRIENTS OF RICE (ORYZA SATIVA L.)
GULSHAN NAHEED, MUAHMMAD SHAHBAZ AND NUDRAT AISHA AKRAM
Abstract: A greenhouse experiment was conducted to assess the influence of rooting medium application of phosphorus on mineral nutrients status of rice (Oryza sativa L.) plants under normal or saline conditions. There were four levels (control, 20, 40 and 60 mmol kg-1) of NaCl and three levels of phosphorus (control, 30 and 60 mg kg-1) applied through rooting medium. Imposition of varying levels of salt stress markedly decreased the plant fresh and dry biomasses due to increase in the leaf, and root Na+, and Cl- concentrations. In contrast, a significant reduction in the leaf and root K+, Ca2+ and root P was also observed in the rice plants. A non-significant effect of salt stress was observed on leaf P, and grain Cl-, K+, Ca2+ and P concentrations. Maximum increase or decrease in these nutrients was observed at 60 mmol NaCl/kg. Different levels of phosphorus applied through rooting medium inhibit the accumulation of Na+ and Cl- in leaf and roots, while enhance the leaf and root K+, P along with Ca2+. Among all levels, 60 mg kg-1 of phosphorous was observed most effective in relation to these nutrients studied in rice plants.
Department of Botany, University of Agriculture, Faisalabad. Corresponding author: shahbazmuaf@yahoo.com |
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