Effect of Chemical and Organic Fertilizers and Interactions With High Potash and Silicon Spraying on Vicia faba L. Antioxidants in Salinity Soil

Afield experiment was conducted during 2014–2015 season to study the effect of two soil fertilizer treatments 200 kg/ha compound fertilizer NPK 18-18-18 and organic manure (10 ton/ha of sheep manure) and their interaction with high potash [1% of N-P-K, 0-5-36] and silicon [0.5 mM of potassium silicate on broad bean antioxidants [superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione (GSH), ascorbic acid and proline] in saline soil (9.4 dS/m). The application of soil fertilizers caused a significant increase in the activity of CAT, APX, GSH, but it had no significant effect on SOD activity. While it caused a significant decrease in proline and a changeable effect on ascorbic acid content whereas compound fertilizer caused a significant reduction in ascorbic acid compared to control. The organic fertilizer caused a significant increase in ascorbic acid compared to control. Foliar fertilizers resulted in significant increase in the activity of CAT, SOD, GSH and proline, but it had no significant effect on APX and ascorbic acid compared to control. The interactions between the factors caused significant effects on all parameters.