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• W2183181399 abstract "Future water supply in Egypt largely will depend on the severity of impacts from climate change which are still uncertainty. However, it is clear that water will be the most critical constraint to agriculture. Field experiments were carried out during summer seasons of 2007 and 2008 in Zanklon Water Research Station, Sharkia, Governorate, Egypt, to study the effect of planting dates (5 planting dates) and three irrigation regimes (60, 80 and 100% of Etc) on yield, water productivity, applied water and actual evapotranspiration in order to select the most appropriate planting date to adopt with climate change. The obtained results indicated that, the interaction effect between planting dates and irrigation levels was significant on grain yield per hectare. Grain yield was decreased by 15.2, 10.2, 11.4 and 23.5% for D1, D2, D4 and D5 planting dates respectively. For irrigation regimes, the obtained data showed that, applying 60 and 80% of the ETc significantly reduced grain yield by 11 and 24.4%. The highest grain yield per hectare was obtained from planting date on June 11 (D3) and irrigation level of 100% of the ETc (I1). The obtained data indicated that the highest value of water productivity (WP) was achieved from D3 followed by D4 while the lowest value was obtained from D1. With respect to irrigation levels, the highest value of WP was achieved at I1 followed by I2 while the lowest value was obtained at I3. Actual evapotranspiration (ETc) values were reduced by (21.9, 17.0, 11.1 and 5.6)% for D1, D2, D3 and D4 respectively comparing to D5. With respect to irrigation levels, the ETc values were gradually increased as the available soil moisture increased at the root zone while exposing plants to soil water deficit decreased the ETc. Applied water (AW) was 824, 788, 758, 723 and 685 mm for planting dates treatments D1, D2, D3, D4 and D5 respectively. These results revealed that using D3 treatment resulted in water saving about 9 and 4% with respect to planting at D1 and D2 respectively. Multiple regression analysis was used to estimate grain yield, applied water and actual evapotranspiration under different climate conditions, the obtained results showed significant correlation between grain yield, applied water and actual evapotranspiration and climate factors (max and min temperature, relative humidity, wined speed and sunshine duration). A prediction model was determined for grain yield (Y), applied water (AW) and actual evapotranspiration (ETc) as function of the previous parameters." @default.
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• W2183181399 date "2012-01-01" @default.
• W2183181399 modified "2023-09-24" @default.
• W2183181399 title "Impact of Planting Dates on Irrigation Requirements and Water Productivity of Maize in Egypt Delta" @default.
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