|Author:||Khalil, F. A. ; Ouda, S. A. ; Tantawy, M. M.|
|Book Group Author:||NA|
Field experiments were conducted during 2004/05 and 2005/06 in Egypt, to study the effect of imposing water stress by skipping the last irrigation on the yield of barley cultivars Giza 123, Giza 125, Giza 126, and Giza 2000. Yield-stress model was used to predict barley yield and water consumptive use. Furthermore, the model was used to predict barley yield and water consumptive use when water stress was imposed during the whole season. The most sensitive variety to skipping the last irrigation was Giza 2000, where relative yield reduction, yield response factor and drought susceptibility index were the highest. The model prediction gave a good agreement with actual barley yield for both growing seasons under application of total irrigation amounts or under skipping the last irrigation. The model results implied that imposing water stress over all the growing season and deducting the same amount that represent the last irrigation could extremely reduce yield losses. The yield losses were reduced from 25.94 to 7.24%. Further, deducting approximately 15% of the total irrigation was even better in reducing yield losses. Under that condition, yield losses were reduced to up to 3.45%. It is recommended not to skip the last irrigation, instead water stress should be impose over all the whole growing season to reduce yield losses.
|Pages:||742 - 747|
|Journal:||Journal of Applied Sciences Research|
barley, crop yield, irrigation, mathematical models, plantwater relations, prediction, water stress, water use efficiency, yieldlosses, Egypt, Hordeum vulgare, North Africa, Africa, MediterraneanRegion, Middle East, Developing Countries, Hordeum, Poaceae, Cyperales,monocotyledons, angiosperms, Spermatophyta, plants, eukaryotes,watering, Field Crops (FF005) (New March 2000), Plant Breeding andGenetics (FF020), Plant Physiology and Biochemistry (FF060), Plant WaterRelations (FF062), Plant Production (FF100), Environmental Tolerance ofPlants (FF900), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management]