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Studies on the Seasonal Fluctuation of Soil Nematodes Population in Sandy and Laterite Soil of Balasore and Mayurbhanj Districts of Orissa

INTRODUCTION The soil in a particular area contains various organic and inorganic matter and supports a number of plants and animals including micro organisms. Usually nematodes both free living and plant parasitic exist in communities containing many species which exhibit efficient dispersal, polyphagy, weak interspecific competition. As most of the workers like Choudhury (1985), Choudhury and Phukan (1990, 1992), Roy and Parija (1987), Khan and Sharma (1990), Khan et al. (1980), Khan, Adhami and Saxena (1971), Sabir (2000), Srivastava et al. (2000), Dwivedi and Upadhyay (2001), De et al. (2004), Sen et al. (2008) studied the population structure of soil nematodes associated with the different crops. Very few workers like Nilova (1961), Khakinov (1971), Das and Mukhopadhyay (1990), Choudhury ans Sivakumar (1999), studied the population fluctuation and vertical distribution of soil nematodes in cultivated and uncultivated soil and in different soil types. So an attempt was made to study the population structure together with the vertical distribution of the soil nematodes present in sandy and laterite types of soil in Balasore and Mayurbhanj districts of Orissa.