Effect of application of steel slag based-sulphur fertilizer on yield and quality of cauliflower, cabbage and capsicum

Steel slag, a waste from steel manufacturing, cannot be directly used in agriculture despite its nutritional characteristics. The present research deciphered the response of sulfur enriched steel slag (16-20% S) on cauliflower, cabbage and capsicum. The performance of steel slag based sulfur fertilizer (SSSF) at 30, 45 and 60 kg S ha-1 with 100 and 50% NPK fertilizer application was evaluated in terms of growth, yield and quality attributes i.e., total antioxidant capacity, ascorbic acid, phenolic content, and pigment system (anthocyanin, lycopene, â carotene, total carotenoid and chlorophyll content). The application of SSSF caused a significant increase (~25%) in economic yield. An increase in physiological and nutritional attributes including antioxidants was also evidenced with the supplementation of the SSSF. The study showed that steel slag based fertilizers can be applied to complement the conventional chemical fertilizers without causing any soil toxicity and phyto-toxicity. In fact, SSSF application helped to save costs (up to 50%) towards NPK chemical fertilizers without any negative impact on the economic yield and nutritional quality of cabbage, cauliflower and capsicum. The study does not reveal any negative effect of steel slag based fertilizer on soil characteristics. Thus, it supports the possibility that an enriched-amended steel slag can be used as source of mineral nutrients in agriculture.