AGRICULTURAL PLASTER FROM RESIDUAL OF INDUSTRIAL AND MINING PROCESSES, A CHEAP AND ECOLOGICAL CORRECT POSSIBILITY. EXAMPLE FROM MINAS GERAIS, BRAZIL

 https://www.researchgate.net/publication/358726311_AGRICULTURAL_PLASTER_FROM_RESIDUAL_OF_INDUSTRIAL_AND_MINING_PROCESSES_A_CHEAP_AND_ECOLOGICAL_CORRECT_POSSIBILITY_EXAMPLE_FROM_MINAS_GERAIS_BRAZIL