الفهرس 
Effect of cultivarsOnly 14 pages are availabe for public view
 |  | from | 257 |  |  |
| | | from | 257 | | |
Abstract
Tluee separate experiments were carried out, during two successive seasons (1 99411 995 and 199511 996) at Sakha Agricultural Research Station Farm; Kafer El-Sheikh, Governorate. The present study aimed to investigate the influence of both available soil moisture depletion and irrigation with salinity water levels of water on growth and yield of some wheat cultivars, namely : Sakha8 , Sakha 69 and Sakha 6 1. A split plot design with four replicates was used in the first and second experiments. The main plots were devoted to in igation treatments, while the subplots were occupied by wheat cultivars. A complete randomize block design with four replicates was used in the third experiment. The first experiment was conducted to stu3y the effect of soil moisture stress on wheat production, it’s water relations and water use efficiency by irrigation at 50%,70% and 90% depletion of i:he available soil moisture. Second experiment was carried out to study the effect of soil moisture stress at different depths of the root zone on wheat production, it’s water relations and water use efficiency by irrigation at 50% and 70% depletion of the available soil moisture fiom the successive deptl~s0 -30 cm up to late booting stage and then fiom 0-60 cm to the last irrigation and before harvesting .While Third experiment was carried out to investigate salt effect on growth and yield of wheat cultivars. A . ~irste xperiment : Effect of soil moist~lres tress on wheat production, it’s water relations and water use efficiency A-1 Growth attributes A-1-1-Plant height Under 50% depletion of the available soil moisture treatment, the wheat cultivars were significantly taller than at 70% and 90% depletion of the available soil moisture treatments, in both seasons . Saltha 69 was significantly taller than Sakha 8 and Sakha 61 in both seasons in 1994 and 1995 respectively . The interaction was highly significant between wheat cultivars and irrigation treatment. A-I-2-Flag leaf area. 50% depletion of the available soil moisture treatment, resulted in larger values of flag leaf area compared to 70% and 90% depletion of the available soil moisture treatment. Flag leaf area in Sakha 61 significantly exceeded Sakha 69 and Sakha 8 in 1994 and 1995 seasons respectively . The cultivars x irrigation treatment was highly significant A-1-3 Dry matter accumulation Irrigation at 50% depletion of the available soil moisture resulted in a significant increase in respect of dry matter acclimulation compared with 70% and 90% depletion of the available soil moisture treatments. Sakha 69 cultivar surpassed Sakha 8 and Sakha 61, at the same time, the difference between Sakha 8 and Sakha 61 was significant in 1994, while in 1995, the difference among wheat cultivars was insignificant . The interaction was highly significant in both growth seasons . A-2- Yield components : A-2-1-Number of spi kes/m2 The largest significant number of spikes/m2 were obtained from 50% depletion of the available soil moisture treatment followed by 70% and 90% depletion of the available soil moisture treatments. Sakha 69 was significantly superior to Sakha 8 and Sakha 61 in both seasons, in 1994 and 1995, respectively . The cultivars x irrigation treatments interaction was highly significant in respect of number of spikes/ m2 in both seasons.