[Lisfauba] AVISO SEMINARIO IFEVA VIERNES 24 de NOVIEMBRE 12:00 Hs

[Facultad de Agronomía UBA]

* Seminario IFEVA*
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*VIERNES24 de NOVIEMBRE 202312.00 hs*

Presencial: SUM *IFEVA*
<https://www.youtube.com/channel/UCCC_QmqL9yuKBnZ6p4mnxBw>
Mitigating crop yield losses through weed diversity.

Autor: *Paolo Barberi*

*Filiación: *Centro di Ricerca di Scienze delle Piante, Sant'Anna Scuola
Universitaria Superiore, Pisa, Italia

*Resumen: *Reconciling crop productivity with biodiversity conservation is
one of the main challenges of agriculture worldwide. The importance of weed
diversity in mitigating yield losses has been identified as one of the top
five research priorities in weed science. In a PhD project run in
collaboration between SSSA (Italy) and INRAE (France), we have tested the
hypotheses that (i) not all weed communities generate yield losses and (ii)
that more diversified weed communities can mitigate yield losses. The study
was based on three years of observations of weed densities, weed biomass
and crop biomass at four critical growth stages of winter cereals across 54
in-field zones (36 unweeded and 18 weeded). Out of the six weed communities
types identified, only four generated significant yield losses in unweeded
zones, ranging from 19% to 56%. The number of winter cereals ears per plant
and the number of grains per ear were systematically affected, but only one
weed community was capable of reducing 1,000-kernel weight. Weed biomass
decreased by 83% over a gradient of weed community evenness, whereas crop
productivity increased by 23%. Diversified weed communities limited the
negative effect of competitive and dominant species on crop productivity
while potentially promoting ecosystem services provided by subordinate
species. Further data indicating the same trend will be shown, and the
implications of these findings for the promotion of low-pesticide,
agroecological cropping and farming systems will be discussed.

*Palabras claves:* Biodiversity conservation; Crop yield losses; weed
communities; weed diversity.
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*Paolo Barberi *is MSc in Agricultural Science and PhD in
Environmentally-Sound Innovative Crop Management Practices, University of
Pisa, Italy. Professor in Agronomy and Field Crops. Coordinator of the
Group of Agroecology, Area Agroecosystem Services, Institute of Life
Sciences. Coordinator, PhD Programme in Agrobiodiversity. Sant’Anna Scuola
Universitaria Superiore Pisa. Research topics: Agroecology, Cropping
systems, Functional agrobiodiversity, Organic and low external input
agriculture, Provision of agroecosystem services, Weed ecology and
management

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*Certificados:* los alumnos que necesiten certificar su asistencia, deberán
enviar su nombre y DNI al moderador (mtexeira en agro.uba.ar) durante el
transcurso del seminario o en la hora posterior a la finalización del mismo
.

*Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la
Agricultura*


IFEVA - Facultad de Agronomía - Universidad de Buenos Aires
 Av. San Martín 4453 - C1417DSE - Buenos Aires - Argentina
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