In a comercial onion crop (Allium cepa) located in Tibasosa, Boyaca, Colombia, the relationship between plant nutrition and severity of damage caused by white rot disease was studied. The soil was classified as sulfic endoamept. At 20 days before sowing (DAS) and at 45, 90 and 120 days after sowing soil samples and esclerotium were taken plant tissue analysis at 45, 90 and 120 DAS was carried out. Also association among soil chemical parameters and plant percentage of damage was estudied. Results showed direct relationship among cooper content in soil (r=0.71), nitrogen in leaves (r=0.46) and magnesium in leaves (r=0.66) with percentage o damage caused by S. cepivorum. Calcium content in leaves (r=0.52), boron in leaves (r=-0.49) and esclerocios in soil Elg (r=0.56) were inversely proportional to percentage of damage. The treatment with the highest percentage of damage had higher contents of N, P and S in leaves and lower K, Ca, Mg, B, Mn, Cu and Zn.