Synergetics of Seasonality and Contrasting Pest Management Strategies on Community Dynamics of Soil Nematodes in Tomato-Growing Agroecosystem

Dipak Gupta, Rashmi Chhetri, Daya Ram Bhusal

Abstract


Nematodes are valuable bio-indicators of soil disturbance in agricultural practices. A study on the seasonal changes of nematode community was conducted during period of May 2017 to March 2018 in historically tomato growing agro-farms in Northern part of Kathmandu valley. The purpose of the study was to explore the effect of seasons and pest management practices on nematodes community. The field experiments were set up within the plastic tunnels of Tomato (Lycopersicon esculentum, srijana strain) cultivated farm to manage the insect pest. We observed the effect of seasons on community composition of nematodes. In this experiment, four types of replicating plots (5 m ×5m) were established and treated: cattle manure (MP), pesticides (PP), botanical pesticides (BP), and control plot (CP). Maximum indicative species are clustered in manure and control plots especially in summer season. Our study indicates the combine effect of treatment systems and seasonality in community composition of nematodes rather than season and treatment alone. There was significantly (P>0.05) low abundance of nematodes with pesticides applying plots in both seasons (winter and summer). Plant feeder and fungal feeder (functional group and feeding guilds) are more responsive towards moisture content and soil temperature whereas bacterivores (cp-2) are associated towards the total nitrogen and organic carbon content in the soil. The combined effect of seasons and treatment strategies that regulate the resources availability is attributed for shaping the nematode community in this experiment.

Keywords


Diversity; Trophic Groups; Feeding Guilds; Soil Nutrients; Physical Parameters; Indicator Species

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