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Effects of
foliar micronutrient application on osmotic adjustments,
grain yield and yield components in sunflower (Alstar
cultivar) under water stress at three stages
Mahdi
Babaeian1*,
Abolfazl
Tavassoli1,
Ahmad Ghanbari2, Yasser Esmaeilian1
and Mohammad Fahimifard1
1Islamic
Azad University, Shirvan branch, Iran.
2Departmant
of Agriculture, Zabol University, Iran.
*Corresponding author. E-mail:
mahdi_bbn@yahoo.com.
Accepted 9 December, 2010 |
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In order to study the effects of foliar micronutrient
application under water stress, at three stages of growth,
on prolinee and carbohydrate concentration, grain yield and
yield components of sunflower (Alstar cultivar), a field
experimental in split plot design with three replications
was conducted in 2007. Alstar cultivar was comprised under
water stress at three stages of growth (heading, flowering
and grain filling) as main plot and seven micronutrient
treatments, Fe, Zn, Mn, Fe+Zn, Fe+Mn, Zn+Mn and Fe+Zn+Mn, as
sub-plots. Results showed that water stress at three stages
of growth significantly decreased grain yield, biological
yield, 1000 weight seeds, cap diameter and cap weight of
sunflower (Alstar cultivar). The impact of water stress was
more pronounced when applied at grain filling. Use of foliar
micronutrient increased grain yield in water stress on the
other hand, use of Mn foliar application had the highest
positive effect on yield components and grain yield. Free
prolinee and total soluble carbohydrate concentration were
increased under water stress, at all of the three stages of
growth. The highest concentration of these two components
was found on the flowering stage.
Key words:
Water stress, micronutrient, grain yield, osmotic
adjustment, sunflower.
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