Abstract:
In hot and arid regions,
drought stress is considered as one of the
main reasons for yield reduction. To study
the effect of drought stress, iron and zinc
spray on the yield and yield components of
wheat, an experiment was carried out during
the crop seasons of 2010 and 2011 on
Shahid Salemi Farm in Ahwaz as a split
factorial within randomized complete block
design with three replications. The main
plots with irrigation factor and three levels
were considered: Level A) full irrigation,
Level B) stopping irrigation at pollination
step, and Level C) stopping irrigation at the
seed filling stage. Subsidiary plots were
considered with and without iron and zinc
spray. Influencing the seed filling process,
in interaction with iron, wich is an important
leaf's chlorophyll cation, zinc increased the
seed yield. The drought stress reduced the
thousand kernels weight (TKW) and the
number of seeds per spike increased about
24% and 8.5% more than the one of control
treatment, respectively. Using iron, as
compared with control treatment, causes the
increase of thousand kernels weight from
45.71 to 46.83 grams and the increase of
spike from 49.51 to 51.73. Zinc spray
increased seed yield and thousand kernels
weight. The results obtained from the
present research showed that iron and zinc
spray has fairly improved the effects caused
by drought stress.
