Earthworms to assess the innocuousness of spent biomixtures employed for glyphosate degradation

CAROLINA MASIN; MAIA LESCANO; ALBA RODRIGUEZ; JOSE LUIS GODOY; CRISTINA ZALAZAR

JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART B - PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES

TAYLOR & FRANCIS INC

Lugar: Londres; Año: 2018

0360-1234

In this study, theinnocuousness of different biomixtures employed for glyphosate degradation wastested through Eisenia fetidaearthworms. Eight biomixtures wereprepared with local materials: alfalfastraw (AS), wheat stubble (WS), river waste (RW) and two different soils (A andB). Each biomixture was divided into two equalportions: one without glyphosate application (control substrate) and the otherwas sprayed with a commercial glyphosate formulation of 1000 mg glyphosate a.i.kg-1 biomixture (applied substrate). The bioassay started when allsprayed biomixtures reached high percentages of glyphosate degradation (spentbiomixtures). Three parameters were studied: survival, adults and juvenilesbiomass and reproduction. The results allowed the identification of threebiomixtures (AWS, BWS and BWSRW) for good maintenanceand development of E. fetida. Inaddition, at the end of the bioassay two of the viable biomixtures (AWS andBWS) showed the highest performance of juvenile earthworms compared to areference soil. The Principal Component Analysis (PCA) indicated that the biomixturescontaining high silt and clay percentages and minor density renders highervalues of earthworm growth and reproduction. Therefore, these innocuous biomixtures can be used as organic amendments or recycled materialsfor new treatments on biobeds.