2024-03-28T14:11:34Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/381742011-11-07T23:00:00Zcom_10261_129com_10261_6col_10261_382
DIGITAL.CSIC
author
Leguizamón, E. S.
author
Rodríguez, N.
author
Rainero, H.
author
Pérez, M.
author
Pérez, L.
author
Zorza, E.
author
Fernández-Quintanilla, César
2011-08-01T09:48:14Z
2011-08-01T09:48:14Z
2009
Weed Research 49: 98-106 (2009)
1365-3180
http://hdl.handle.net/10261/38174
Field trials were established in various growing seasons
in four experimental sites with soyabeans or maize
grown under no tillage systems. Seeds of Digitaria
sanguinalis, Eleusine indica, Sorghum halepense, Setaria
geniculata, Echinochloa colonum and Urochloa platyphylla
were incorporated in surface soil, under the crop
residues of the previous season, each autumn. Regular
records of seedling emergence during the following
spring and summer were used to model the pattern of
each species as a function of the thermal time in the 2 cm
upper layer of the soil profile. A Weibull function closely
described (r2 = 0.73–0.93) the relationship between
thermal time and seedling emergence for all species in
each site and year. The coefficient of determination for
the model verification ranged from 0.71 to 0.98. Species
may be grouped into three emergence time-span groups.
Eleusine indica, U. platyphylla and E. colonum had a
long-lasting emergence, requiring 940–1660 d C (growing
day degrees) to complete this process. Digitaria
sanguinalis and S. halepense had an intermediate
emergence time-span, completing this process in 540–
1090 d C. Setaria geniculata exhibited the shortest
emergence time-span (290–660 d C required for full
emergence). Different hypotheses were tested in order to
explain species model parameter differences in different
sites and to establish the basis for more refined models
with improved prediction capabilities.
eng
closedAccess
Weibull function
Seedling emergence
Thermal time
Herbicide decisions
Digitaria sanguinalis
Echinochloa colonum
Eleusine indica
Setaria geniculata
Sorghum halepense
Urochloa platyphylla
Modelling the emergence pattern of six summer annual weed grasses under no tillage systems in Argentina
artículo
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