EI-Harls, M. (2004). DEFICIT IRRIGATION OF ·WHEAT UNDER SPRINKLER IRRIGATION IN THE NEWLY RECLAIMED SOILS OF EGYPT. Journal of Soil Sciences and Agricultural Engineering, 29(4), 2183-2199. doi: 10.21608/jssae.2004.241902
Mamdouh K. EI-Harls. "DEFICIT IRRIGATION OF ·WHEAT UNDER SPRINKLER IRRIGATION IN THE NEWLY RECLAIMED SOILS OF EGYPT". Journal of Soil Sciences and Agricultural Engineering, 29, 4, 2004, 2183-2199. doi: 10.21608/jssae.2004.241902
EI-Harls, M. (2004). 'DEFICIT IRRIGATION OF ·WHEAT UNDER SPRINKLER IRRIGATION IN THE NEWLY RECLAIMED SOILS OF EGYPT', Journal of Soil Sciences and Agricultural Engineering, 29(4), pp. 2183-2199. doi: 10.21608/jssae.2004.241902
EI-Harls, M. DEFICIT IRRIGATION OF ·WHEAT UNDER SPRINKLER IRRIGATION IN THE NEWLY RECLAIMED SOILS OF EGYPT. Journal of Soil Sciences and Agricultural Engineering, 2004; 29(4): 2183-2199. doi: 10.21608/jssae.2004.241902
DEFICIT IRRIGATION OF ·WHEAT UNDER SPRINKLER IRRIGATION IN THE NEWLY RECLAIMED SOILS OF EGYPT
Department of 5011 & Water S~I., College of Agriculture, Alexandria Unlvers itv, Alexandria 21545, Egypt
Abstract
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 (l<y) of 0.735. 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
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