Efficacy of nitrogen salts at 2, 4, and 8 mmhos/cm electrical conductivity (EC) on the host-pathogen relationship of root-knot nematode (Meloidogyne javanica) and cucumber (Cucumis sativus) was investigated and compared with the effects of nematicides at 2 locations. Root galling of cucumber roots caused by M. javanica was more effectively suppressed using ammonium-containing salts: NH 4 Cl, (NH 4 ) 2 HPO 4 and (NH 4 ) 2 SO 4 at EC4 and EC8 than at EC2 and in a similar effect level of the

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... cide, oxamyl or ethoprophos, and the reduction was accompanied by a reduction in the nematode final population number. At higher EC levels, NH 4 Cl followed by (NH 4 ) 2 SO 4 led to an increase of salinity up to about 1750 and 1245 mg/kg, respectively, without affecting cucumber growth and yield. Diammonium phosphate was superior over the ammonium salts in increasing cucumber growth and yield despite root-knot infection. Use of nitrogen salts could control M. javanica and improve growth and yield of cucumber under field conditions.