Vol. 3, No. 1, 1995

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    A Note on the Effect of Cutting Management on Seed Production in Lucerne (Medicago sativa L.)
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Nayel, B.A. ; Khidir, M.O.
    A filed experiment was conducted in the Demonstration Farm of the Faculty of Agriculture, University of Khartoum, to study the effect of cutting management on seed yield of lucerne and some of the yield components. The design of the experiment was complete randomized block with three replications. Three treatments were applied; namely, (i) seed production without cutting (C0), (ii) seed production following two cuttings (C1) and (iii) seed production following 14 cuttings (C2). The results indicated that C2 produced significantly more number of pods/unit area, more number of pods/raceme and more seed yield/ha than C1 and C0, and there was no significant difference between C0 and C1
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    An Economic Analysis of Some Agronomic Experiments on Barley Production in Saudi Arabia
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Osman, G.S.
    The Kingdom of Saudi Arabia is the world leading barley- importing country. To achieve self-sufficiency, the government provides a subsidy of 50% of the costs for the major inputs and offers a support price of SR 1000/ton (US.$ 267/ton) for barley. Agronomic experimental data for barley production incorporating nitrogen fertilizer and water as inputs were collected to estimate the demand for nitrogen fertilizer and the supply of barley, and both of them were found to be highly inelastic. The findings support an output price support policy to an input subsidy. Fertilizer and barley supply prices can be increased and reduced, respectively, without any significant adverse effects on barley supply.
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    Methane Fermentation of Cowdung: Effect of Loading Rate
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Mekki, I. I ; El.Amin, H. B.
    Biogas production from cowdung was investigated on a laboratory scale using semi-continuous fermentation techniques, with loading rates of 2.5,3.5 and 4.5 g OM/L/day. A retention time of 30 days was employed for all three loading rates. The loading rate of 4.5 g OM/L/day gave the highest gas production and methane content. Increasing the load rate, generally, increased biogas production but greatly decreased the yield per unit weight. Percentage decomposition rates of organic solids were 26, 25 and 22 for the loading rates of 2.5, 3.5 and 4.5g OM/L/day, respectively. The experiment continued for 45 days (one and half turn) although the steady state was reached 30 days after the start of the process. A complete gas analysis at the steady state revealed that biogas contained an average of 65% methane, 31.9% carbon dioxide and 2.5% carbon monoxide; oxygen was not detected. Volatile fatty acids did not retard biogas production and pH level was kept automatically between 6.0 and 7.0.
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    Effect of Lysine and Methionine Supplementation on the Nutritive Value of Sorghum Gluten Meal- based Diets
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Mohamed, L. H. ; El Zubeir, E. A.
    Two experiments were conducted to study the effects of lysine or methionine or both supplementation to sorghum gluten meal (SGM)-based diet containing no supplemental lysine or methionine. In experiment 1, addition of 1.1 g/kg methionine alone to SGM-based diet had no significant effect on weight gain, feed intake and feed conversion ratio. However, addition of 9.6g/kg lysine alone or with 1.1 g/kg methionine to SGM-based diet improved (P<0.05) weight gain, feed intake and feed conversion ratio. In experiment 2, weight gain (Y) of the birds decreased as dietary sorghum gluten level (X) increased such that Y= 697.35- 11.77X. A similar relationship between feed intake (Y) and SGM level (X) was also observed (Y= 1405 - 14.22X). The dietary treatments (experiments 1 and 2) had no significant effect on liver, pancreas and abdominal fat relative weights.
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    The Impact of Some Factors on Nodulation of Acacia spp.
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) El Atta, H. A. ; Osman, U. E.
    The study demonstrated the impact of soil moisture, temperature and soil reaction (pH) on nodulation of six Acacia sPage(s): A.nilotica, A. senegal, A seyal, A.tortilis, A.mellifera and A.albida (Faidherbia albida). Increasing the soil moisture content from 15% to 35% doubled the frequency of nodulation in A. mellifera, A. tortilis, A. nilotica and A. senegal, whereas the frequency of nodulation was tripled in A. seyal and A. albida. The relatively low mean temperature recorded in winter resulted in a considerable reduction in nodules from that of the summer. Mean frequency of nodulation increased from 6.5 nodules in winter to 15.3 nodules in summer. Nodulation of A. nilotica was the most sensitive to soil temperature where mean frequency of nodules/plant increased five times in summer as compared to winter nodulation. Soil reaction proved to be the most inhibitive factor for nodulation. Absolutely no nodules were produced by any plant in acidic soil. Nodulation was minimum in alkaline soil, whereas maximum nodulation occurred in a slightly acidic soil. The study shed the light on the impact of the three most important factors limiting nodulation of Acacia spp.