Nematodes are ubiquitous. They respond to soil inputs and management practices and can be used as a measure of the biological response of soils to these manipulations (Bohlen and Edwards 1994). Fertilizers and herbicides are regularly being used to enhance crop production. But information on the behaviour of nematodes under the continuous use of these agricultural inputs in a fixed crop sequence over the years in meager. This study was carried out during the 30th year of the long-term fertilizer experiment initiated in 1971 with the rice-wheat-cowpea system at Pantnagar (29o N, 79o 3’ E) on an Aquic Hapludoll in northern India. The climate is humid subtropical (Nand Ram 1995).