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67 Introduction 69 Materials and Methods 70 Results and Discussion 73 Summary and Conclusion 84 CHAPTERS: GENERAL CONCLUSION 87 APPENDIX 89 REFERENCES 92 ACKNOWLEDGMENTS 100 LIST OF FIGURES Chapter 2 Figure I: Map of Ethiopia showing the study site -Alemaya Chapter 3 Figure 1: Field layout and unit plot dimensions of the alley-cropping study Figure 2: Layout of the experimental plot showing root sampling distances Chapter 4 Figure 1: Soil moisture content (%) within a sorghum alley, 50 cm from Acacia hedges Figure 2: Soil moisture content (%) within a sorghum alley. 50 cm from Gliricidia hedges Figure 3: Soil moisture content (%) in sole-cropping at 50 cm distance Figure 4: Soil water potential (centibars) within a sorghum alley, 50 cm from Acacia hedges Figure 5: Soil water potential (centibars) within a sorghum alley. 50 cm from Gliricidia hedges Figure 6: Soil water potential (centibars) in sole-cropping at 50 cm distance

Root production, soil organic matter, soil moisture, and sorghum yield in an alley-cropping system with Acacia saligna (Labill.) Wendl. and Gliricidia sepium (Jacq.) Walp. in the Hararghe Highlands, Eastern Ethiopia