A survey of the nematodes from nine soil samples collected from the plantation                             in three farming system soils (organic agriculture, good agricultural practices ,and conventional farming systems)     in three district provinces (Don Talum, Kamphaeng Saen ,and Mueang Nakhon Pathom) of Nakhon Pathom Province have investigated their diversity. There were isolated from soil by the Baermann-funnel method    and Sucrose Technique. Identification of nematodes is based on morphological techniques. The result showed that were found in the genus of the plant-parasitic nematodes were non-significantly different (p≤0.05) from agricultural systems. Classified into 3 genera of plant-parasitic nematodes: Helicotylenchus sp., Meloidogyne sp., Rotylenchulus sp., and order Triplonchida.