Response of roselle to plalnt spacing under flood irrigation in the Gash Delta
2006
Osman, M.E. (Agricultural Research Corporation, Shambat Research Station, Khartoum (Sudan))
Roselle was evaluated for yield of dry calyx at different plant spacing in six locations and for five seasons in the Gash Delta. Two of these seasons were considered as demonstrations under extreme soil moisture conditions. Seeds of a mixed landrace (ELRahad) were sown at inrow spacing of 40, 60, 80, 100 and 120 cm along furrows 80 or 100 cm wide in seasons 1986-87 (2 locations), 1992-93 and 1993-94. Demonstrations were executed in seasons 1988-89 and 1990-91. The flood irrigation periods were different in the 4 locations, viz. 10, 20, 25 and 30 days. The highest yield of dry calyx was recorded at the spacing of 60 x 80 cm and 80 x 80 cm, although the effects of inrow spacing on yield was not significant. When the flood period was 20 30 days, the highest calyx yields were obtained at the closer in-row spacing of 40 and 60 cm; while in shorter flood periods of 10 days the yield was higher at 80 cm. The overall mean yield at the low flood irri gation of 4 or 10 days was 306 and 439 kg/ha, while at 20 days the yields were 550 and 703 kg/ha. The highest yield of 1067 kg/ha was recorded at flood period of 2530 days
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