Vol. 8, No. 1, 2000

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    A Note on the Effect of Intercropping and Rhizobium Inoculation on the Seed Quality of Faba Bean (Vicia faba L.)
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 2000) Elsheikh, E.A.E. ; Ahmed, E.I.A.
    A filed experiment was conducted during 1996/97 growing season in the Demonstration Farm of the Faculty of Agriculture at Shambat to study the effect of intercropping and Rhizobium inoculation on the physical and chemical characteristics of faba bean seeds. Rhizobium inoculation and/or intercropping treatments significantly increased the ash, crude fibre and fat and protein content of the seeds compared to the uninoculated monocrop control. The carbohydrate content was significantly decreased, whereas the moisture and tannin contents were significantly increased by inoculation. The hard seed percentage was neither affected by the Rhizobium treatments nor by the intercropping methods.
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    A Note on the Effect of the Angle of Orientation and Type of Basal Cuts on Rooting of Cuttings
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 2000) Eltahir, F.H. ; Mahgoub, B.A.
    This study was carried out to provide information on the effect of the angle of orientation and type of basal cuts on the rooting of cuttings of three ornamental plants; namely, lantana (Lantana comara), ferry rose (Rosa sp.) and gardenia (Taberneamontana coronaria). Data were collected on rooting percentage, root length, number of roots and leaves, number of days required for root emergence and survival percentage of the rooted cuttings. The results indicated the importance of the angle of orientation and the type of basal cuts in rooting ability.
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    Field Operating Parameters Affecting Harvesting Losses of Wheat in Rahad Scheme (Sudan)
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 2000) Bakhit, S.A.E. ; El Shami, O.M.E. ; Mohamed, H.I.
    Harvesting losses of wheat grains (preharvest, header, and processing losses) in Rahad Scheme were studied with regard to the field operating parameters (forward speed, time of harvest, crop variety, and machine make and age). Field surveys of commercial combine harvesters in 1995/96 and 1996/97 seasons were conducted, using a stratified sampling technique. The results showed that the forward speed, time of harvest and machine age affected the harvest losses significantly, while the crop variety and machine make showed non-significant effects. Speeds of 5.9 and 6.1 km/hr were found to be the optimum speeds with minimum header and total machine losses. Time of harvest and machine age were linearly related to harvesting losses, but no definite relation was found for crop variety and machine make. However, the wheat variety "Debeira" and Claas combine harvester showed less loss than the variety "Condor" and John Deere harvester. The total harvesting losses were 66 and 74 kg/fed. for 1995/96 season and 1996/97 season, respectively. The estimated value of the average total harvest losses (70 kg/fed.) was equivalent to the value of 16 new grain combine harvesters.
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    The Composition and Degradation in the Rumen of Goats of Different Parts of Different Forage Trees in Gezira (Sudan)
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 2000) Elimam, M.E. ; Babiker, M.A.A.
    A trial was conducted to determine the chemical composition of different parts of some forage trees in the Gezira (Sudan). Artificial fibre bags were used to determine their degradation in the rumen of three Nubian goats. The results showed that there were variations in the composition and degradation characteristics in the rumen of Nubian goats of different parts of some forage trees in the Gezira. The crude protein was highest in the leaves of Acacia mellifera followed by the leaves of Ziziphus abyssinica. and A. mellifera pods. It was the least in Ficus sp. fruits and leaves. The crude fibre was highest in the pods of A. mellifera followed by Ficus sp. leaves and A. albida pods, and was the least in the leaves of Z. abyssinica. The degradation of crude protein was higher than that of dry matter and organic matter. The degradation percentages were higher for the pods of A. albida followed by the leaves of A. melifera and the leaves of Z. abyssinica, and was the least for the leaves of Ficus sp. Higher degradabilities were generally associated with higher degradation rates. The results showed that forage trees have a good nutritive value and should be used before full maturity.
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    Effect of Some Selected Herbicides on Weed Control and Yield and Quality of Sugarcane
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 2000) Hassan, O.E. ; El Amin, S.E.
    A weed control experiment was conducted for two consecutive seasons (1994/95 and 1995/96) at the research farm of the Kenana Sugar Company to evaluate the efficacy of two new herbicides in controlling weeds in sugarcane and assessing some modifications of the present practices. Diethenamid at 1.8 and 2.0 kg / ha displayed good activity (83.25 to 88.75 % control) on grasses early in the season. However, late season control was poor and inconsistent. Imazethapyr performed poorly on both grasses and broad-leaved weeds. Tank mixtures of atrazine at 1.8 kg/ha and pendimethalin at 2.0 kg/ ha or atrazine and ametryne at 2.0 kg/ ha each, maintained satisfactory to excellent control of all weeds for 8-12 weeks after treatment. Increasing herbicide rate did not improve weed control significantly. Unrestricted weed growth decreased cane height, stalk population and yield by 33.31, 57.43 and 63.21%, respectively. Diethenamid and imazethapyr did not improve cane growth or yield significantly. Atrazine in tank mixtures with pendimethalin and ametryne increased cane growth and yield. Cane height, stalk population and yield were often comparable to those obtained from the weeded control.