Effect of Irrigation interval, intra-row spacing and sowing date on seed yield and yield components of local lupine (lupinus termis forsk.) in the Nile River State in Northern Sudan
2007
El-Fahal, E.M., Agricultural Research and Technology Corporation, Shendi Agricultural Research Station, Shendi (Sudan)
The effect of irrigation interval, intra-row spacing and sowing date on the yield and yield components of lupine were studied during three consecutive seasons (1986/87, 1987/88 and 1988/89) at Shendi Agricultural Research Station farm in the Nile River State in northern Sudan. Three irrigation intervals (7, 14 and 21 days), four intra-row spacings (10, 15, 20 and 25 cm, equivalent to seed rates of 72, 43, 36 and 21 kg/feddan, respectively) and five sowing dates (15 October, 30 October, 15 November, 30 November and 15 December), were tested in a split-split plot experimental design with four replications. Differential irrigation was applied after crop establishment.The results indicated that lupine yield was significantly affected by irrigation interval and sowing date. Yield increased consistently with frequent irrigation and earlier sowing. Watering every 14 and 21 days reduced seed yield by 33 and 53 % compared to the 7 day irrigation interval. There was a reduction in seed yield by 5, 15, 43 and 69% when sowing was delayed to Oct. 30, Nov. 15, Nov. 30 and Dec. 15, respectively compared to 15 Oct. Intra-row spacing did not affect lupine yield, but the trend was a general decrease in yield with wider spacing. Frequent irrigation and early sowing significantly increased the number of pods per plant. The number of seeds per pod was not affected by any of the factors tested. 1000-Seed weight was significantly affected by sowing date only.To maximize the yield of lupine, it is advised to plant the seeds every 20 _ 25 cm on both sides of 70 cm ridges during the period from mid October to mid November and irrigating every 7 to 14 day interval
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