Steel slags are good solutions to rise the pH and to reduce cation toxicity in soil inorder to reduce the soil acidity. The following paper would provide you some effective ideas on potential no-tillage use of steel slags:

DOI: 10.5772/intechopen.81440

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Steel slag is chemically reactive but how it has interaction biologically with plant that one has to check. Again what form of steel slag can be utilize is questionable. Elaborate your question so that further information can be shared.

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I mixed the slag with cement and made concrete and checked all its parameters carefully.