Response of new cotton (gossypium L.) varieties to nitrogen fertilization in Sudan, Gezira
2010
Ibrahim, M.A., Agricultural Research Corporation, Wad Medani (Sudan) | Ahmed, K.E., Agricultural Research Corporation, Wad Medani (Sudan) | Osman, S., Agricultural Research Corporation, Wad Medani (Sudan) | Ali, E.S., Agricultural Research Corporation, Wad Medani (Sudan) | Hamada, A.A., Agricultural Research Corporation, Wad Medani (Sudan)
The growth and yield responses of three newly released cotton (G. hirsutum L.) varieties to nitrogen fertilization were evaluated in a twoyear (2006 -2007) field experiment at Gezira Research Station, Central Sudan. Three cotton varieties, (Hamid, Khairalla and Knight) and six equidistant N rates (0N, 30 _150 kg N/ha) were arranged in a split plot design with four replicates. The varieties were assigned to the main plot and N rates to the subplot. Results indicated similar trends of response of the three varieties, but, with varying relative responses of each variety to nitrogen rates. Significant differences in yield potential among the three varieties were also detected. Averaged across the nitrogen rates, the variety Hamid gave 31 and 14% yield advantages over Khairalla and Knight, respectively. Averaged across the two seasons and the three varieties, cotton growth, seed cotton and lint yields were significantly and progressively increased with the rise in the levels of added nitrogen up to the application of 60 kg N/ha. The leaf nitrogen content of the three varieties at eleven weeks from emergence was not affected, but increased significantly with added nitrogen levels without an indication of variety x nitrogen interaction
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