8th INTERNATIONAL WHEAT CONFERENCE

effeCT of defICIT IRRIgATIoN IN dIffeReNT gRoWTh
STAgeS oN WheAT gRoWTh ANd yIeLd
Seyed Abdolreza Kazemeini, Mohsen Edalat
Crop Production and Plant Breeding Dept., College of agriculture, Shiraz University, Shiraz,
Iran
E-mail Address of presenting author: kazemin@shirazu.ac.ir
In order to evaluate of the effect of deficit irrigation in growth stage on wheat growth
and yield, a field experiment was conducted in the 2008-2009 growing season based on
the completely randomized block with four replications at the experimental farm of the
College of Agriculture, Shiraz University, Shiraz, Iran, located at Badjgah. Treatments
involved 13 irrigation regimes which applied in stem elongation, heading and grain filling
growth stages. The highest seed yield (4333 kg ha -1 ) and the lowest ones (1377 kg ha -1 )
were obtained from T1 (100%FC in all growth stages) and T13 (50%FC in all growth
stages) respectively. With limitation in water amount seed yield was diminished, but this
trend was not significant in T4 (100%, 100% and 50%FC) and T11 (100%, 100% and
75%FC). Stepwise regression results revealed that, seed number per spike had the largest
role (partial R 2 =0.72) in seed yield variation. Also in T1, T4 and T11 treatments (well
water treatments) and in T13 (sever stress) ear number m -2 was the most role in seed
yield determination (partial R 2 =0.96). It can be concluded that decreased water applied
amount in the grain filling period and its allocation to the other consecutive crop, can
increase crop production in southern regions of Iran.
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