Effects Of CO₂ And Nitrogen Levels On Yield And Yield Attributes Of Rice Cultivars

Abstract

A pot experiment was conducted at Bangbandhu Sheikh Mujibur Rahman Agricultural University during July–December of 2003 to determine the effect of rice varieties under CO₂ enrichment and different levels of nitrogen supply. Plants were grown from seedling to maturity inside open top chamber under elevated CO₂ (570 ±50) ppm, ambient CO2 (~360ppm) and open field condition. Cultivars responded considerably under different nitrogen levels. Increasing atmospheric CO₂ directly stimulated photoynthesis and plant growth resulting in increased grain yield. Among the cultivars, BRRIdhan 39 gave the highest yield (50.82 g/plant1) at supra optimum N level and elevated CO₂. Local varieties gave similar results under elevated CO₂ in optimum and supra optimum N level. The lowest yield was produced by the local variety Shakkorkhora (15.09 g) under ambient CO₂ with no nitrogen application.

Keywords: CO₂ enrichment; nitrogen level; rice cultivars

DOI: http://dx.doi.org/10.3329/bjar.v36i2.9247

BJAR 2011; 36(2): 213-221