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• W2591844518 abstract "An experiment was conducted on wheat growing at different levels of water supply ranging between 200 and 600 mm. to find out the efficiency of rainfall at the different levels for productivity and its effect on the water relations of plants. A water supply equivalent to 200 mm was found to be the least level required for production of grains. At this level the plant tissues suffered a considerable water deficit of about 34%. The rate of root growth was examined under extreme conditions of water supply. Under dry conditions the maximum vertical depth reached by the root was 25.9 cm, whereas under wet conditions the maximum vertical depth attained by roots was 68.2 cm. Under the unfavourable dry conditions the root demonstrated a consistent slow growth throughout the growth period. Under the favourable conditions, the root exhibited rapid growth in length in the first month after sowing, followed by very slow growth. It nearly ceased to grow after two months. The effect of drought on yield and water relations of plants was studied on plants subjected to different periods of drought of 3, 4, 5, 6, 7 and 8 weeks without irrigation during the leafy stage, then irrigated regularly at intervals of 15 days. The desiccation of leaves started in plants exposed to four weeks of drought with one dry basal leaf. The permanent wilting percentage of the soil was reached when the dry period attained 7 weecks. The plants of the two last treatments though they were apparently dry and subjected to a soil moisture at the permanent wilting percentage or below, yet they survived. This is due to the uninjury of the terminal bud being protected by the rolling top leaves. The transpiration rate exhibited a pronounced decrease when the length of the drought period exceeded 5 weeks. Plants subjected to a droyght period of 7 weeks suffered a saturation deficit of about 50% and still surviving. The osmotic pressure exhibited a great rise with the extension of the drought period reaching 38.1 atm. after 6 weeks of drought compared with 16.3 atm. after 3 weeks from irrigation. The productivity of plants is highly influenced by the length of the drought period. When the plants were subjected to a drought period of 7 weeks and more, they failed to produce grains. Though plants subjected to a period of 7 weeks carried ears, yet the latters were empty without grains." @default.
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• W2591844518 date "1972-01-01" @default.
• W2591844518 modified "2023-09-24" @default.
• W2591844518 title "Contributions to Water Requirements of Wheat under Desert Conditions" @default.
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• W2591844518 doi "https://doi.org/10.1016/s0367-2530(17)32095-9" @default.
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