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. The experiment was carried
out in a split plot in Randomized Complete Block Design (RCBD) with three replications during May 2010 to July
2011.