INVESTIGADORES
MIRALLES Daniel Julio
artículos
Título:
). Comparative behavior of wheat and barley associated with field release and grain weight determination)
Autor/es:
ALVAREZ PRADO S; GALLARDO J; SERRAGO RA; KRUK B; MIRALLES D.J
Revista:
FIELD CROPS RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 144 p. 28 - 33
ISSN:
0378-4290
Resumen:
Double-cropping using the wheatsoybean sequence is a common practice in Argentina to promote the
intensification of crops within rotations. However, the late release of the fields by a delayed harvest time
in wheat determines soybean yield penalizations. In this context, barley could represent a better option
than wheat preceding soybean in the crop rotation since there is some evidence that finishes its cycle
earlier than wheat. However, it is not clear which period of barley shortens crop cycle allowing an earlier
field release than wheat. The objectives of this study were to compare wheat and barley in terms of (i)
field release and (ii) grain weight determination through the analysis of their physiological mechanisms.
Field experiments during two consecutive growing seasons testing five different environments (three
sowing dates in 2007 and two in 2008) were carried out to analyze the duration of different ontogenic
periods and the attributes (dry matter and water dynamics) determining grain weight during the grainfilling
period in wheat and barley. Early flowering time was the main cause of the early field release
by barley as the grain filling and drying period were similar in both species. A strong relationship was
found between dry matter and water dynamics in both species. Barley reached a higher maximum water
content than wheat and also achieved physiological maturity with higher moisture concentration than
wheat (48% and 39%, respectively). Barley showed a slight increase in grain weight, respect to wheat, due
to a source:sink ratio enhancement (4% and 9% for wheat and barley, respectively). These data show an
opposite response to that of Mediterranean, Australian and UK environments, where barley was under
stronger sink limitation than wheat during the grain-filling period.