Influence of sulphur and magnesium on bulb yield and biochemical parameters in onion

A field experiment was conducted to find out the influence of sulphur and magnesium on biochemical parameters in onion cultivar Nasik Red. The experiment considered of eight levels of sulphur (10, 20, 30, 40, 50, 60, 70 and 80 kg/ha bensulf) and four levels of magnesium (20, 30 and 40 kg/ha MgSO₄ and 250 kg/ha magnesite) along with RDF. Results revealed that the chlorophyll content (a, b and total) increased from 60 to 80 DAS in all the treatments, while nitrate reductase activity was maximum at 60 DAS. With an increase in both sulphur and magnesium levels, there was increase in both the nutrients. Both the parameters were significantly higher with magnesite (250 kg/ha) compared to control. However, it did not differ significantly with 40 kg/ha MgSO_4. The maximum chlorophyll content and NRA were recorded in 80 kg/ha sulphur compared to all other treatments. Pungency content and total soluble solids also followed similar trend with 80 kg/ha sulphur having the maximum values over all other treatments. Significant reduction in storage losses were also recorded with applications of sulphur and magnesium as compared to control.