Effect of slag-based gypsum (SBG) and commercial gypsum (CG) on nutrient availability, uptake and yield of rice (Oryza sativa L.) in two different soils

Slag-based gypsum (SBG) is a synthesized product of steel industry. SBG has better plant nutritional value in terms of sulphur (S), calcium (Ca), phosphorus (P), iron (Fe), silicon (Si) and traces of other micro-nutrients. Field experiments were conducted with randomized complete block design (RCBD) to evaluate the effect of SBG over commercial gypsum (CG) on nutrient availability, uptake and yield of rice in Mandya and Chamarajanagara soils. In both the soil conditions, application of 750 kg SBG ha(-1) recorded significantly higher grain and straw yield of rice compared to CG and control treatments. Application of SBG significantly increased the exchangeable calcium, magnesium (Mg) and available sulphur content of both the soils. Exchangeable sodium (Na) content decreased with increased application of SBG and CG in both the soils. Higher content of diethylene triamine pentaacetate (DTPA) extractable micronutrients in both the soils was noticed with the application of 750 kg SBG ha(-1) when compared to other treatments. Higher uptake of nutrients was recorded with the application 750 kg SBG ha(-1) when compared to other treatments. In conclusion, application of SBG increased the nutrient availability, uptake and yield of rice in both the soils when compared to CG application and it can be a promising alternative source to many commercial and natural gypsum sources in modern day rice farming.

Automated summary

The study showed that slag-based gypsum (SBG) significantly increased the yield and nutrient uptake of rice, making it a promising alternative source for many commercial and natural gypsum in modern rice farming.