Kotb, M., Gaballah, E. (2007). INFLUENCE OF GLYCINEBETAINE AND NITROGEN LEVELS ON GROWTH AND YIELD OF BARLEY (HORDEUM VULGARE L.) UNDER DROUGHT CONDITIONS. Journal of Productivity and Development, 12(1), 45-60. doi: 10.21608/jpd.2007.44939
Maher Kotb; El Sayed Gaballah. "INFLUENCE OF GLYCINEBETAINE AND NITROGEN LEVELS ON GROWTH AND YIELD OF BARLEY (HORDEUM VULGARE L.) UNDER DROUGHT CONDITIONS". Journal of Productivity and Development, 12, 1, 2007, 45-60. doi: 10.21608/jpd.2007.44939
Kotb, M., Gaballah, E. (2007). 'INFLUENCE OF GLYCINEBETAINE AND NITROGEN LEVELS ON GROWTH AND YIELD OF BARLEY (HORDEUM VULGARE L.) UNDER DROUGHT CONDITIONS', Journal of Productivity and Development, 12(1), pp. 45-60. doi: 10.21608/jpd.2007.44939
Kotb, M., Gaballah, E. INFLUENCE OF GLYCINEBETAINE AND NITROGEN LEVELS ON GROWTH AND YIELD OF BARLEY (HORDEUM VULGARE L.) UNDER DROUGHT CONDITIONS. Journal of Productivity and Development, 2007; 12(1): 45-60. doi: 10.21608/jpd.2007.44939
INFLUENCE OF GLYCINEBETAINE AND NITROGEN LEVELS ON GROWTH AND YIELD OF BARLEY (HORDEUM VULGARE L.) UNDER DROUGHT CONDITIONS
1Department of Agronomy, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt.
2Plant Production Department (Agronomy), Institute of Efficient Productivity, Zagazig University, Egypt.
Abstract
Two field experiments were conducted in a sandy soil in the extension field in El–Salhia region, Sharkia Governorate during 2004/2005 and 2005/2006 seasons to study the effect of three levels of nitrogen (45, 65 and 85 kg N/fad) and three glycinebetaine rates (0, 8 and 12mM/fad) on the growth and yield of barley (Giza 124 cv.) under two irrigation intervals (weekly irrigated and di-weekly irrigated). The most important findings could be summarized as follows: Irrigation every two weeks instead of one week reduced significantly all growth attributes. The relative decrease percentages were 25.41 and 22.93%, 22.63 and 19.98%, and 25.11 and 26.19% for flag leaf blade area, total chlorophyll and relative water content in both seasons, respectively. Addition of 85 kg N/fad increased these traits by 12.80 and 13.63%, 1.88 and 3.50%, and 3.28 and 4.59% in the first and second seasons, respectively compared with the addition of 45 kg N/fad. Meanwhile, using 12 mM glycinebetaine (GB) increased these traits by 20.63 and 23.06%, 32.30 and 35.80%, and 22.57 and 30.40% in the first and second seasons, respectively compared with untreated plants. Under stress or non stress condition, increasing N level from 45 to 85 kg/fad without GB did not increase total chlorophyll. Meanwhile, this trait was increased significantly with increasing GB from zero to 12 mM. Prolonging the period of irrigation from 7 to 14 day reduced significantly the yield and its attributes. The relative reduction percentages for grain and straw yields were 22.73 and 26.02% and 26.73 and 24.79% in both seasons, respectively. Increasing N-level from 45 kg to 85 kg N/fad increased grain yield, straw yield and mean productivity by 12.84 and 12.78%, 16.43 and 14.7%, and 12.88 and 12.85% in both seasons, respectively. Meanwhile, the relative increase percentages due to application of 12mM GB/fad compared with zero GB were 21.27 and 24.77%, 24.82 and 26.83%, and 21.30 and 24.73% for these traits in both seasons, respectively. The interaction between frequent irrigation, zero GB and 45 kg N/fad gave 11.38 ardab/fad compared with 15.34 ardab/fad which was obtained from frequent irrigation, 8mM GB/fad and 85 kg N/fad. Meanwhile, the interaction between drought condition, zero GB and 45 kg N/fad gave 8.66 ardab/fad compared with 11.69 ardab/fad which was obtained from drought condition, 8mM GB/fad and 85 kg N/fad treatments.
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