SUNFLOWER YIELD AND CLIMATIC VARIABLES
2013
A group of hybrids with higher oil yield was selected from the comparative
yield trials carried out in the EEA Pergamino, during seasons 2004-2005,
2005-2006 and 2006-07. The objective was to study the associations between
seed yield, oil content, oil yield and climatic variables obtained from two
methods: stepwise and principal component analysis. Both methods arrived at
similar results confirming the associations between yield and climatic
variables. Positive correlation between seed yield and thermal amplitude was
obtained in sowing- flowering, as well as between oil yield and thermal
amplitude in flowering- maturity. The seed yield was negatively correlated
with the hours of sunlight (heliophany) and rainfall in sowing-flowering. The
oil content was positively correlated with the hours of sunlight (heliophany)
in flowering- maturity and with thermal amplitude in flowering maturity. As
the variations of climatic variables have a substantial importance in
determining yield, the selection of stable genotypes would be an important
contribution to sunflower breeding.
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