Abstract:
The experiment was
conducted during Rabi season of 2015-2016
and 2016-2017 at the Regional Agricultural
Research station, BARI, Ishurdi, Pabna,
Bangladesh, to determine the water
requirements of wheat on raised bed and the
effect of different deficit irrigation on yield,
water use efficiency and applied water
productivity under raised bed wheat. This
study consisted of following irrigation
treatments: T1 = Irrigations up to 100% field
capacity (FC) at crown root initiation (CRI),
botting and grain filling stages (flat bed), T2
= Irrigations up to 100% FC at CRI, botting
and grain filling stages on raised bed, T3 =
Irrigations up to 80% FC at CRI, botting
and grain filling stages on raised bed and T4
= Irrigations up to 60% FC at CRI, botting
and grain filling stages on raised bed and
laid out in a randomize complete block
design with three replications.The result
showed that significant effect of irrigation
treatments were observed on plant height,
spike per m2 and grain yield. Highest grain
yield (4.66 t/ha) was obtained from
treatment, irrigations up to 100% FC at CRI,
botting and grain filling stages on raised
bed, followed by irrigation up to 100% FC
at same stages on flat bed. At raised bed
wheat cultivation saving 14.30% water with
increasing 15.66% grain yield than flat bed.
Besides, comparing deficit irrigation (20%
and 40% of full irrigation) and full irrigation
condition on raised bed seeding system
water use could be reduced about 4.18% to
5.57%, while scarifying 18.20% to 32.33%
grain yield, where reduced 14.17% to
27.54% water use efficiency. Maximum
applied water productivity 1.81 kg m-3 was
observed in raised bed full irrigation
condition. The rate of daily evaporation
started to increase as the temperature started
to rise and humidity started to decrease
during the crop growing period. The results
will be helpful for taking policy decision
regarding efficient irrigation and water
management under prevailing water scarce
situation.
