Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : STUDIES OF PARAMETERS OF DROUGHT RESISTANCE IN SOME CROPS

Auteur : MOHAMED, ATTEYA MOUSTAFA.

Etablissement de soutenance : Cairo University

Grade : Master of Science (MS) in Botany 1990

Résumé partiel
Under arid conditions the water supply is limited and it is of prime importance to study the water economy and water use efficiency of plants. In Egypt only about 6% of the land area can be irrigated with Nile water. The rain¬fall is limited and it varies widely in the different desert regions from rainless deserts in the south to limited rain¬fall in coastal deserts where it reaches about 250 mm per annum. The agriculture in the coastal deserts depends on the rainfall, run off water accumulating in wadis and lowlands. Also the underground water is an important source of irrigation water in desert regions. The study of the drought tolerance and water use efficiency is very important under adverse cond¬itions of water supply. Previous studies showed considerable variations in the water economy and drought tolerance of the Different cultivars of the same species. Since wheat is a very important crop the present investigation is aiming to compare the water economy of five important cultivars of wheat and to find out the most productive cultivar under conditions of shortage of water supply. The increase in irrigation interval associated with increase in moisture stress resulted in reduction in vegetative growth. The studied vegetative growth criteria were, fresh and dry weight of shoot and total leaf area per plant. With decrease in water supply due to increase in irrigation interval there was a remarkable reduction in vegetative growth of all the studied cultivars. Under conditions of deficiency in water supply due to increase in irrigation interval the cultivar ” Giza 160” exhibited the greatest vegetative growth. The response of yield to water regime followed the same trend as in vege¬tative growth. There was a remarkable reduction in yield with deficiency in water supply resulting from increase in irrigation interval. The highest yield under deficiency in water supply was recorded in cultivar ” Giza 160”.

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