Effects of long-term turfgrass management on soil nematode community and nutrient pools
Advisor:Grewal, Parwinder S.
Contributors:Stinner, Benjamin R.
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Series/Report no.:Environmental Science Graduate Program. Graduate student poster competition, 2006
The impact of long-term turf management practices on soil nematode abundance, community structure and soil nutrient pools were studied in replicated Kentucky bluegrass (Poa pratensis) plots maintained under nine different organic and inorganic management regimes for 15 years in Delaware, Ohio. After the application of inputs was stopped for one year, soil samples were collected in July and October. All free-living and plant-parasitic nematodes were identified to genus level and counted. Total nematode abundance, free-living nematode (FLN) abundance, plant-parasitic nematode (PPN) abundance, species diversity, richness, evenness, maturity index (MI), plant-parasitic index (PPI), combined maturity index (CMI), and FLN/PPN ratio were calculated. In addition, soil nematode faunal profile analysis was conducted to determine soil food web condition. NH4-N, NO3-N, dissolved organic nitrogen (DON), microbial biomass nitrogen (MBN), and soil organic matter (SOM) were measured to describe soil status. Results showed that in general, nematode abundance and food web indices were not differently affected by 9 management regimes. However, nematode community indices, MI and CMI, were significantly lower and Enrichment Index was significantly higher under high N-input compared to low N-input management. Herbicide, insecticide, or fungicide applications had no significant effect on nematode community in turfgrass soil ecosystem. Overall, the soil food webs were highly enriched but poorly to moderately structured in all management regimes. In addition, organic turf management resulted in higher soil microbial biomass compared to inorganic management or the control.
Ohio Lawn Care Association, Ohio Turfgrass Foundation, Urban Landscape Ecology Program
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