Effect of seed rate, disk angle and time of application of Sarwala on weed control and crop yield of rain-fed sorghum
2006
Yousif, L.A., Agricultural Research Corporation, Gedarif (Sudan) | Ali, M.A., University of Gezira, Wad Mednai (Sudan) , Faculty of Agricultural Sciences | Dawelbeit, M.I., Ministry of Agriclture and Forestry, Khartoum (Sudan)
Field experiments were carried out in Northern Gedarif State during the seasons 1998/1999 and 1999/2000, at two different sites, to evaluate the Sarwala operation. It is a process whereby a wide level disk (WLD) plow is passed through a sorghum field for the purpose of weeding as well as striga control. The factors tested in the experiments were seed rate (7.5 and 5.5 kg/fed), WLD plow disc angle (10° and 5° ccw) in addition to two application dates of the Sarwala practice (25-30 and 40-45 days from crop emergence). The results indicated that the Sarwala operation reduce- ed plant population by about 58.8 %, striga count by about 75.5 % and weeds) by about 65%. The seed rate of 7.5kg /fed resulted in significantly higher striga numbers before the Sarwala than the seed rate of 5.5kg/fed. The first application date (25-30 days) resulted in significantly lower striga numbers better weed control taller plants and higher sorghum yield than the Second application date (40-45 days). The results indicated that the Sarwala operation significantly increased sorghum grain yield: This increase in yield varied from three to nine folds in both seasons. The highest yield was obtained by applying the Sarwala operation after 25-30 days from emergence; at disc angle of 10° ccw and the seed rate of 7.5 kg /fed
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