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Assiut University (2017)

Studies on the response of some salt tolerant crops to salinity of soils and underground irrigation water in El-Kharga, New Valley governorate

Ahmed, Ahmed Talaat Sayed.

Titre : Studies on the response of some salt tolerant crops to salinity of soils and underground irrigation water in El-Kharga, New Valley governorate

Auteur : Ahmed, Ahmed Talaat Sayed.

Etablissement de soutenance : Assiut University

Grade : Doctor of Philosophy (PhD) in Agricultural Sciences 2017

Résumé partiel
Considerable area of El-Kharga Oasis suffers from soil salinity either due to the shale composition of the soil or to the source of irrigation water. Some farmers used to dig deep holes of 15-30 m depth to collect drainage water coming from the neighboring areas and use this water for irrigation. Salinity of the water of these areas varied considerably from less than 2.0 dS/m up to more than 12.0 dS/m. The study locations areas have three water irrigation different in salinity from Loc.1, Loc.2 and Loc.3 with water salinity of 2.0, 5.2 and 10.7 dS/m, respectively. One best management to cultivate these areas is to select crop genotypes tolerant to salinity of soils or irrigation water. In this study some crop genotypes were selected to evaluate its tolerance to different levels of soil and water salinity in three villages of El-Kharga Oasis, New Valley governorate during the period of 2012/2014. Tested crops included four wheat varieties (Sakha 93, Okas, variety 6 and variety 14), Pearl millet (Shandweel 1 cult.) and Sorghum (Dorado cult.) Growth and yield of these genotypes were used to evaluate its tolerance to salinity under the prevailing conditions of El-Kharga Oasis. The role of Nitrogen and Potassium fertilizers on alleviating the effect of salinity on these crops was also evaluated in this study. The selected wheat genotypes were cultivated in the winter season of 2012 and 2013 in three locations with different levels of soil and water salinity. Two forage crops were cultivated in the summer season of 2013 and 2014 in the same selected locations. These crops are Pearl Millet (Shandweel 1) and Sorghum (Dorado) Three new wheat varieties selected by the genetic Dept. faculty of Agric. Assiut Univ. including Okas, variety 6 and variety 14 beside the local variety Sakha 93 were used in this experiment. The experiment was conducted in split-split plot design, with three replicates. The main plots were assigned to the two nitrogen levels : 100% and 125% of the recommended rate (120 kg N/fed), the sub plots were subjected to the two levels of potassium 100% and 125% of the recommended rate (50 kg K2O/fed), the sub-sub plots were subjected to the four wheat genotypes. Area of each plot was 3x3.5 m (1/400 feddan). Seeds of wheat (Triticum aestivum) were sown at 26th of November 2012 and 23rd of November 2013 and harvested at 17 of May 2013 and 15 of May 2014, respectively. Nitrogen was added as ammonium nitrate (33%N) ; nitrogen rate was split into four doses : the first dose (20%) was added at sowing, the second dose (50%) was added at first irrigation, the third dose (20%) was added at 45days from sowing and the last dose of N (10%) was added at 55 days from sowing. Meanwhile potassium fertilizer was applied as potassium sulphate (48% K2O) and phosphorus fertilizer as supper phosphate (15.5% P2O5). Both were added in one dose at sowing. Plant samples were taken randomly from ¼ m2 of each plot after 60 days of sowing. Shoot fresh weights were immediately determined, then plants were washed with tap water, followed by distilled water and dried at 70 oC for 48 hrs. and there dry weight were determined, these procedure is repeated at 75 days after sowing. Concentration of N, K and Na (%) were determined in the samples. Number of tillers per plant and plant height were measured.

Présentation étendue (EULC)

Page publiée le 22 décembre 2020