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Tanta University (2020)

EFFECT OF CLIMATE CHANGE ON WHEAT AND MAIZE CROPS IN NORTH NILE DELTA SOILS

Ali, Marwa Gamal Mohamed.

Titre : EFFECT OF CLIMATE CHANGE ON WHEAT AND MAIZE CROPS IN NORTH NILE DELTA SOILS

Auteur : Ali, Marwa Gamal Mohamed.

Etablissement de soutenance : Tanta University

Grade : Doctor of Philosophy (PhD) in Agricultural Sciences 2020

Résumé
This study was carried out at Sakha Agricultural Research Station, Egypt. The objectives of this study were : 1. Calibrating and validating CERES-Wheat and N-Wheat for wheat and CERESMaize and IXIM-maize models for maize under different irrigation regimes and cultivars 2. Assessment the simulated water use and water use efficiency of wheat and maize under different irrigation regimes using the calibrated models 3. Estimating the impact of climate change on growth, yield, water use and water use efficiency of wheat and maize using calibrated and validated models under different GCMs in three time series (2030, 2050 and 2080). 4. Exploring the most suitable planting dates for wheat and maize achieving higher yield under climate change scenarios. This study included wheat and maize experiments and conducted in in large (12.0 m3) volumetric lysimeters (1.5 × 2.5 m, height 3.0 m) filled with non-saline clay soil since 1994. The lysimeters were placed in an open field and surrounded with wheat in winter and maize in summer to decrease the edge-effects produced by the lysimeters. The experiment was conducted in a large lysimeter during two successive seasons of , 2016/2017 and 2017/2018 for wheat and 2017 and 2018 for maize in a split-plot design, with three replicates. To ensure genetic variability under current conditions, the main plots were assigned to two wheat and maize cultivars. Gemiza9 is sensitive to higher temperatures and drought, while Misr1 is more resistant to both higher temperatures and drought for wheat. Meanwhile, maize cultivars are single cross 10 (SC10) and tri hybrid 24 (TWC24), representing tolerant and sensitive varieties respectively. The sub plots were devoted to three irrigation treatments. These were 35, 55 and 75% soil moisture depletion (SMD). The 55 % SMD was taken as the control. This value is representative of traditional farmer irrigation. The wheat (Triticum aestivum, L) variety Gemiza9 and Misr1 were sown on 20 November in both seasons and harvested on 05 May and 25 April in first and second growing seasons respectively. While, maize (Zea mays L) varieties single cross10 and tri hybrid24 were sown on 15 May and harvested on 05 September and 28 August for first and second seasons respectively.

Présentation étendue (EULC)

Page publiée le 25 février 2022