This study explores whether Thermomagnesium (TM), a by-product of Ni ore mining, is an efficient fertilizer for maize. The effects TM on soil pH, the supply Si and Mg to plants, carbohydrate metabolism, grain filling, yield were assessed in two simultaneous experiments performed greenhouse conditions. Five doses applied textures—clayey (0, 55, 273, 709, 2018 mg kg−1) sandy 293, 410, 645, 1260 k...