The cassava cultivar KU 50, HB 60 and HB 80 were grown on Map Bon, coarse-loamy variant, sandy loam, low organic matter at Khao Hin Son Research Station, Khao Hin Son, Phanom Sarakham, Chachoengsao, Thailand, to evaluate the combination effects of zinc, magnesium and sulphur foliar fertilizer management on yield and quality of cassava.