Department of Botany, Lucknow University, Lucknow 226 007
Onion (Allium cepa L.) var. Nasik was grown in refined sand under acute deficiency (0.04 meq/litre), subnormal (1 meq/litre) and adequate (4 meq/litre) levels of sulphur. The visible effects of low sulphur were more pronounced under acute deficiency than under sub-normal level of sulphur. Sulphur deficiency resulted in a decreased biomass, loosely arranged bulb formation, lowered bulb yield, reduced concentration of sulphur and protein, lowered activity of starch phosphorylase and ribonuclease, with elevated activity of catalase, peroxidase and acid phosphatase and increased concentration of phosphorus and magnesium in onion leaves.
