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Department of Botany, D.A. V. College, Muzaffarnagar, 251001, India

ABSTRACT

The present study deals with the effect of SO₂ gas under field conditions on paddy (Oryza sativa L.) var. IR 8, a very popular cultivar in District Muzaffarnagar. Experimental plants were treated with SO₂ gas produced inside a fumigation chamber for 30 min every day in the morning hours. A control experiment was run simultaneously. Results show that the effect of SO₂ varied according to concentration, i.e. the lower the concentration of SO₂ the higher the biomass of vegetative parts and vice versa. Uptake of nitrogen increased up to earing stage; thereafter it declined to the harvest stage in both control and treated plants. Release of nitrogen was recorded from the earing stage to the harvest stage.