SPATIAL PATTERNS OF SOIL NEMATODE COMMUNITIES IN TOMATO (Lycopersicon esculentum Mill.) GROWING AGRO FARMS IN KATHMANDU VALLEY, NEPAL

Dipak Gupta, Daya Ram Bhusal

Abstract


Soil nematodes play a vital role in ecological processes and soil food web. Nematodes are valuable bio-indicators of soil disturbance in agricultural practices. Therefore, they can be used to understand the biological mechanisms of the soil. The aim of the study was to observe the abundance and diversity of soil nematode communities in different tomato (Lycopersicon esculentum Mill.) growing agrofarm sites in Kathmandu Valley. Nematodes were extracted by Cobbˈs sieving and decanting method from the collected soil samples. Altogether 39 genera of soil nematodes belonging under 19 families of five trophic groups were recorded from the Kathmandu valley, with 16 genera of each bacterivorous and plant feeder, 3 genera of omnivorous and 2 genera of each predator and fungivorous feeding group. Out of 19 families, the highest genera of nematodes were recorded from families Tylenchidae and Cephalobidae. The abundance of nematode genera is well discriminated in our analysis. One-way ANOVA was used to compare the richness of nematode genera (per plot) among these agrofarm sites and the generic richness of nematodes in Kathmandu, Bhaktapur and Lalitpur were significantly different (df = 2, MS= 13.36, F= 5.78, P=0.005). We highlighted the need for further exploration of the diversity and community dynamics of soil nematodes under different pest management practices in Tomato growing agrofarms for sustainable soil ecosystem service in Nepal.


Keywords


Agrofarm; diversity; soil nematodes; trophic groups; diversity

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