Two seasons field experiments were conducted lit Sugar Bet! I regioo. Wesl
Nubaria on wheat (Triljcum aestivum L.) cv. Sai(ha 8 under sprinkler Irrigatk>n system.
The aim of this study was to lnves~ate the effect of detldt Irriga60n and N Iertilizetion
rata on yield and yield components 01 wheat grown in the newly reclaimed sons thai
facing condltions of limited Irrigation water In ()(der to accomplish opUmum production.
Five regimes of irrigation were randomly assigned as main plots. and two N
fertilization rates 143 and 214 kg ba' (60 end 90 kg/redden) as sub-plots In e split plO1
design. The Irrigation regimes were selected to Impose water stress throughout the
growing season. and stress at one of the grow1h stages of wheat (vegetative.
flowering. and yield format~n), in addition to full irrigallon. Imposing the stress at a
certain 5tage imply thai only SO % of the crop evapotransplraticn (ET,) was applied In
lnigation. Data showed that the live irr"lgahon regimes resulted In grain yield o( 280 t,
4571, 4~5. 3994. and 5390 kg ha", respectively. These values were corresponding
to actual evapotranspiration (8.) of 207.9.312.6,3814.338.6, and 449.5 mm, croo
fac10r (~) o( 0.449. 0.676. 0.825. 0.728. and 0 973. yield response ftlcw (l0.735.
037B. 0.538. 0.595. and 0.178\ and water use effider.cy (WUE) of 13M, 1450,
11.44. 11.89. and 11.98 kg he per mm ET., r&spectJvely. The saving of irrigalion
water due 10 deficits at the vegetative. flowering. and yield formation stages were
26.8, 13.2. and 23.4% resulted In reduction of grain yield 15.2. 19.4. and 25.9%,
respectively. Several water regimes of low water application gave grain yiEtlds. which
were insignlflcanlly differenl (rom Ihe lull inigalioo treatment. R81:luclng the applied N
fertilizer from 214 10 143 kg ha·¹ (33.3 %) resulted in reduction o( grain yield from 4504
1039.38 kg na' (12.6 %). and had little effects on the other yield Characteristics This Sludy s~d Ihal the efficienl use of lim~ed amount or irrigalion water
available for wheat production was reached if applied to relieve stress during f1o~ring
(rnic- late-F ebruary to mid- late-March) followed by yield lorrnatlon (late-March 10 mid-
April), and least during vegetative BIage (mid-December to late-F ebruarv). This can be
coupled wilh the appllcatton of N ferlilizer rate 01143 kg na' which leads to optimum
yield and environment sustainability