Vol. 6, No. 2, 1998

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    Effect of Different Weed Competition Periods on Yield and Quality of Sugarcane
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1998) Hassan, O.E. ; El Amin, S.E
    A field experiment was conducted for two consecutive seasons (1994/95 and 1995/96) at the research farm of Kenana Sugar Company to study the damage inflicted by weeds on sugarcane yield and quality. Losses in yield due to the presence of weeds were estimated at 58.1%. Six months after planting, weed competition reduced crop stand (stalk population) by 67.7% and lowered the stalk height by 21.4% at harvest. Stalk thickness was insensitive to competition. Weed competition during the first 45 days did not affect the final yield, but its continuation beyond this period drastically reduced yield components, and the magnitude of the reduction was a function of the duration of competition. Tillering was mostly affected by weed competition, while the effect on juice quality was insignificant.
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    Response of Guava Trees to Foliar Application of Bayfolan Fertilizer
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1998) Eltahir, F.H. ; Ali, I.I.
    Different concentrations of Bayfolan fertilizer, namely 0, 10, 20, 30 and 40 ml/L ater were applied to the foliage of guava trees grown under orchard conditions at El Rahad Agricultural Scheme to study their effects on growth, nutrient elements content of the leaves and yield. The results showed that all concentrations of Bayfolan led to significant increase in tree height and trunk circumference. The nutrient elements content of the leaves tended to vary depending on the concentration of Bayfolan applied and the sampling date. Significantly high leaf-N, P and Zn contents were detected in trees receiving various concentrations of Bayfolan. The differential treatments had virtually no effect on leaf-K, Ca and Mg contents. Leaf-Fe, Mn and Cu contents tended to increase slightly. Foliar application of Bayfolan at different concentrations was associated with greater yield; each increase in concentration resulted, in most cases, in a significant increase in yield.
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    Influence of Foliar Fertilizers on Growth Characteristics and Leaf Nutrients Content of Guava Seedlings
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1998) Eltahir, F.H. ; Ali, I.I.
    The response of guava seedlings, grown under nursery conditions, to foliar application of different fertilizer materials was studied. Three foliar fertilizers were used, namely Foliar-X, Compound Cryst and Bayfolan. The potted seedlings were sprayed 12 times during the study period of 6 months, using recommended concentrations. Data were recorded on the following growth parameters: plant height, stem diameter, number of leaves, relative growth rate, leaf area and fresh and dry weights of leaves, stems and roots. Leaf nutrients content was determined at the termination of the experiment. The results showed that all foliar fertilizers resulted in significantly higher values of all growth parameters than the control. The highest values of all growth parameters were obtained in plants sprayed with the Foliar-X, followed by Compound Cryst and then Bayfolan. Leaf-N, P, K, Ca, Mg and Zn contents were significantly greater in the sprayed plants than the control. Significantly greater leaf-N, P, Ca, Mg and Zn contents were associated with Foliar-X or Compound Cryst than Bayfolan.
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    Effect of Polyacrylamide (P4) on Growth, Yield and Yield Components of Chick pea Under Drought Conditions
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1998) Al-Gosaibi, A.M. ; AL-Tahir, O.A
    A potometer experiment was conducted in a greenhouse at King Faisal University Experimental Station, Al-Hassa, Saudi Arabia, for two seasons (1995/96 and 1996/97) to investigate the effect of gel-forming soil conditioner Polyacrylamide (P4) on growth, yield and yield components of chickpea (Cicer arietinum L.) grown under drought conditions. Chickpea was established on calcareous sandy soil mixed with P4 and subjected to two soil moisture regimes promoting droughted and "well-watered" (control) plant growth. The use of P4 with high amount of irrigation water reduced the number and dry weight of nodules/plant compared to the control treatment. High soil water content reduced the harvest index as a result of excessive vegetative growth at the expense of pod formation. The number of pods/m2 and the number of seeds/pod were reduced as the volume of irrigation water was reduced, and the reductions were significantly greater in No P4 than P4. Plants in both soil media responded similarly at the driest treatment and gave significantly fewer pods/m2 and seeds/pod. Compensation in seed weight occurred in some cases when seed number had been reduced. However, chickpea yields reductions averaged 54.7% and 35.5% in wet soil No P4 and P4, respectively. Average yield of droughted chickpea in P4 potometers was 1.35% greater than yields in potometers with No P4.