Cover crops in pear (Pyrus communis) orchards: effects on soil nematode assemblage

Authors

  • Claudia Viviana Azpilicueta Ministerio de Producción e Industria. Laboratorio de Servicios Agrarios y Forestales. Santiago del Estero 426 C. P. 8300. Neuquén. Argentina
  • María Cristina Aruani Universidad Nacional del Comahue (UNCo). Facultad de Ciencias Agrarias. Ruta 151. Km 12,5. Cinco Saltos. C. P. 8303. Río Negro. Argentina
  • Pablo Reeb Universidad Nacional del Comahue (UNCo). Facultad de Ciencias Agrarias. Ruta 151. Km 12,5. Cinco Saltos. C. P. 8303. Río Negro. Argentina

DOI:

https://doi.org/10.48162/rev.39.111

Keywords:

nematode trophic groups, soil food web, metabolic footprint, soil physicochemical properties, pear tree

Abstract

Long-term vegetation cover can affect soil organic carbon content and carbon flow within the soil food web. Nematode trophic structure and soil properties were evaluated in pear rows (intra) maintained without weeds applying herbicide and in the inter-rows (between rows) covered with: Medicago+grasses (MG), fescue or spontaneous vegetation. Soil samples were taken at 0-20 and 20-40 cm depths from 2012 to 2014. Nematode assemblage was different in each inter-row and row, mainly in the topsoil. The inter-rows were reservoirs of omnivores-predators. The MG inter-row promoted the highest accumulation of organic carbon, total N and exchangeable K in the soil. The enrichment index was related to the quantity of dry matter produced by cover crops with the highest index observed in MG. Nematode biomass showed a positive correlation with intra and inter-rows soil organic carbon. Carbon flow through bacterivores prevailed in intra-rows, while bacterivores or herbivores canalized the inter-rows.

Highlights:

  • Each cover crop (Medicago+grasses,  spontaneous vegetation and fescue) was associated with a different nematode assemblage, mainly in the topsoil.
  • Omnivores-predators were higher in the inter-row than its associated row.
  • Nematode Biomass showed a positive correlation with the content of SOC in the row  and in the inter-row.
  • Soil energy channels revealed higher carbon flow within the soil food web under Medicago+grasses and spontaneous vegetation than under fescue.

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Published

21-09-2023

Issue

Section

Plant protection