IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Development and validation of a model of lodging in sunflower
Autor/es:
SPOSARO1, M.M., BERRY2, P.M., STERLING3, M, HALL1, A.J. Y CHIMENTI1 C.A.
Lugar:
Córdoba, España
Reunión:
Congreso; 17th International Sunflower Conference; 2008
Institución organizadora:
International Sunflower Association
Resumen:
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ABSTRACT
Root and stem lodging cause significant
yield losses in sunflower (Helianthus
annuus L.) production in Argentina. Lodging is defined as the permanent
displacement of the stem from its vertical position without possibilities of
recovering. Few studies have investigated the mechanistic processes of root or
stem lodging and no one have attempted to interrelate the complex interactions
between climatic and soil variables, husbandry practices and plant characteristics
for sunflower lodging. Model of lodging had been developed for wheat and barley
and can be used as base for sunflower lodging model. The objectives of this work
are to develop a root/stem lodging model for sunflower and to validate it. The
root lodging model calculates the root failure wind speed using as main
variable the root plate diameter. The thickness of the epidermis+cortex
measured in the lower third of the stem was the main variable used as input by
the stem lodging model for the calculation of the stem failure wind speed. This
model was tested against individual field experiments in which natural root or
stem lodging had occurred at different crop development stages under different
husbandry practices and it could recreate the differences observed in the field
between hybrids and crop population densities in relation to lodging
susceptibility. A parametric analysis showed the root plate diameter and
epidermis+cortex as the main variables of the model and indicated that sunflower could be more
susceptible to root than stem lodging.
Key
words: Epidermis+cortex
failure wind speed model testing root lodging root plate diameter
stem lodging