ABSTRACT

Slag-based gypsum (SBG) is produced from LD slag (Linz-Donawitz slag) which is a byproduct of the steel industry. As the constituents of SBG are almost similar to the commercial gypsum (CG), two field experiments on acidic and alkaline soil under aerobic and wetland conditions were conducted to know their performance on rice. The treatments included recommended dose of fertilizer (RDF) as control, 300, 450, 600 and 750 kg ha⁻¹ of SBG and CG along with RDF. Application of 750 kg SBG ha⁻¹ recorded higher grain (6.15 and 9.22 t ha⁻¹, respectively) and straw yield (10.80 and 12.71 t ha⁻¹, respectively) in acidic and alkaline soils. The application of 750 kg SBG ha⁻¹ increased the pH of acidic soil from 4.56 to 5.00 and from 9.04 to 9.37 in alkaline soil. Available nutrients in the post-harvest soil increased with the increase in the application rates of SBG and CG in soil. There was an increase in total uptake of the nutrients by the rice crop with an increase in application rates of SBG and CG. Application of a graded levels of SBG recorded higher grain and straw yield, nutrient uptake and nutrient availability in comparison to CG.

摘要

矿渣基石膏 (SBG) 由钢铁工业的副产品 LD 矿渣（Linz-Donawitz 矿渣）生产。由于 SBG 的成分与商业石膏 (CG) 几乎相似，因此在有氧和湿地条件下对酸性和碱性土壤进行了两次田间试验，以了解它们在水稻上的性能。处理包括作为对照的推荐肥料剂量 (RDF)、300、450、600 和 750 kg ha ^-1的 SBG 和 CG 以及 RDF。在酸性和碱性土壤中施用 750 kg SBG ha ^-1记录了更高的谷物（分别为 6.15 和 9.22 t ha ^-1）和秸秆产量（分别为 10.80 和 12.71 t ha ^-1）。应用 750 kg SBG ha ⁻¹将酸性土壤的 pH 值从 4.56 提高到 5.00，将碱性土壤的 pH 值从 9.04 提高到 9.37。随着SBG和CG在土壤中施用量的增加，收获后土壤中的有效养分增加。随着 SBG 和 CG 施用量的增加，水稻作物对养分的总吸收量增加。与 CG 相比，分级水平的 SBG 的应用记录了更高的谷物和秸秆产量、养分吸收和养分有效性。