Rob Rhykerd
Department Chairperson
Agriculture, Department of
International Experiences
Country: Papua New Guinea
Activities Abroad:
Work: Collaborative Research Project
Specializations: International Agronomy
Other experiences: Coordinated ISU Department of Agriculture Study Abroad in France, 2003; International Agriculture Publications: Ossom, E.M., N.S. Mavuso, and R.L. Rhykerd. 2011. Maize-sweetpotato intercropping influences on agronomic characteristics and soil chemical properties in Swaziland. Botswana Journal of Agriculture and Applied Sciences. (in press); Ossom, E.M., R.L. Rhykerd, and C.L. Rhykerd. 2010. Ecological Properties under Sunnhemp (Crotalaria juncea L.) Green Manuring of Sweetpotato (Ipomoea batatas (L.) Lam.) in Swaziland. American-Eurasian J. Agric. & Environ. Sci. 9:364-375.; Nxumalo, G.N., E.M. Ossom, R.L. Rhykerd, and C.L. Rhykerd. 2010. Alfalfa (Medicago sativa L.) Green manuring and ecological properties under corn (Zea mays L.) culture in Swaziland. Advances in Environmental Biology. 43:477-484.; Maganula, N.E.M., E.M. Ossom, R.L. Rhykerd, and C.L. Rhykerd. 2010. Effects of Chicken Manure on Soil Properties of Sweetpotato [Ipomoea batatas (L) Lam] Cultured in Swaziland. AEJA (in press); Ossom, E.M., R.L. Rhykerd, and C. Tfwala. 2010. Effects of Filter Cake Fertilization on Soil Chemical Properties and Cassava (Manihot esculenta Crantz) Yield in Swaziland. Research Journal of Agriculture and Biological Sciences 6(5): 600-606.; Mayisela, M.D., E.M. Ossom, and R.L. Rhykerd. 2010. Influence of different Groundnut (Arachis hypogea L.) populations on physiological growth indices and yields under intercropping with a fixed sweet potato [Ipomoea batatas (L.) Lam.] population. Journal of Applied Sciences Research. 6(2) 165-176.; Ossom, E.M. R.L. Rhykerd, and C. Tfwala. 2009. Influence of filter cake on agronomic characteristics of cassava (Manihot esculenta Crantz) in Swaziland. World Journal of Agriculture. 5(2):228-236.; Kuhlase, L.M., E.M. Ossom, and R.L. Rhykerd. 2009. Effects of Plant Populations on Morphological and Physiological Parameters of Intercropped Sweetpotato [Ipomoea batatas (L.) Lam. and groundnut (Arachis hypogea). Academic Journal of Plant Science. 2(1):16-24.; Ossom, E.M., L.M. Kuhlase, and R.L. Rhykerd. 2009. Effects of Plant Population on Yield Component and Yield of Intercropped Sweetpotato [Ipomoea batatas (L.) Lam. and Groundnut (Arachis hypogea). American-Eurasian Journal of Agronomy. 2(1):1-6.; Ossom, E.M., M.H. Nxumalo, F.M. Badejo, and R.L. Rhykerd. 2008. Preserving sweet potato [Ipomoea batatas L. (Lam.)] tubers under traditional storage methods in Swaziland. Tropical Agriculture. 85(2)161-169.; Ossom, E.M. and R.L. Rhykerd. 2008. Effects of lime on soil and tuber chemical properties and yield of sweet potato [Ipomoea batatas (L.) Lam.] in Swaziland. American-Eurasian Journal of Agronomy. Vol. 1(1)1-5.; Ossom, E.M. and R.L. Rhykerd. 2008. Implications of Associating Sweetpotato [Ipomoea batatas (L.) Lam.] with Different Groundnut (Arachis hypogea L.) Populations on Tuber Yield and Soil and Tuber Chemical Properties. Journal of Agriculture and Environmental Science 3(1):63-69.; Ossom, E.M., and R.L. Rhykerd. 2007. Effects of Lime on Weed Species Diversity and Yield of Sweet Potato [Ipomoea batatas (L.) Lam] in Swaziland. International Journal of Agriculture and Biology. 9(5): 755-758.; Ossom, E.M., and R.L. Rhykerd. 2007. Phaseolus vulgaris L. population density affects intercropped Ipomoea batatas (L.) Lam. Transactions of the Illinois State Academy of Science 100(1):13-23.; Rhykerd, R.L., E.M. Ossom, C. Nowak, and C.L. Rhykerd. 2007. Forming partnerships with overseas colleagues. Transactions of the Illinois State Academy of Science 100(1): 25-35; Ossom, E.M. and R.L. Rhykerd. 2007 Response of Ipomoea batatas L. (Lam.) to soil amended with filter cake. Transactions of the Illinois State Academy of Science. 100 (3 & 4):197-208.; Ossom, E.M., M.H. Nxumalo, and R.L. Rhykerd. 2006. Contributions of grain legume companion crops to sweet potato [Ipomoea batatas (L.) Lam.] ecological properties and yield in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology 9 (2): 149-158.; Ossom, E.M., S.T. Zwane, and R. L. Rhykerd. 2006. Plant population effects on ecological characteristics of field bean (Phaseolus vulgaris L.) in Swaziland. Transaction of the Illinois State Academy of Sciences. 99:1-15.; Ossom, E.M., M.H. Nxumalo, F.M. Badejo, and R.L. Rhykerd. 2005. Mineral concentration in sweet potato [Ipomoea batatas L. (Lam.)] tubers grown alone and intercropped with pulses and preserved under different methods. Tropical Agriculture 82(1):68-73.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Comparison of land equivalent ratio, yield and income from intercropping Ipomoea batatas (L.) Lam with pulses in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology. 8:(2)108-112.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Intercropping influences morphological development, weed suppression and yield of Ipomoea batatas (L.) Lam. UNISWA Research Journal of Agriculture, Science and Technology. 8(2):87-102.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Effects of intercropping pulses with Ipomoea batatas L. on plant mineral concentration and soil chemical properties in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology 8(1):26-35.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, C.L. Rhykerd. 2003. Influence of mulch on soil temperature, nutrient content, yield component and storage root yield of Ipomoea batatas (L.) Lam. Indian Journal of Agricultural Sciences. 73:57-59.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, C.L. Rhykerd. 2003. Influence of mulch on soil temperature, nutrient content, growth and yield of sweet potato [Ipomoea batatas (L.) Lam.]. UNISWA Research Journal of Agriculture, Science and Technology, 6:137-146.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, and C.L. Rhykerd. 2001. Effect of mulch on weed infestation, soil temperature, nutrient concentration, and tuber yield in Ipomoea batatas (L.) Lam. in Papua New Guinea. Tropical Agriculture 78:144-151.
Country: Swaziland
Activities Abroad:
Work: Collaborative Research Project
Specializations: International Agronomy
Other experiences: Coordinated ISU Department of Agriculture Study Abroad in France, 2003; International Agriculture Publications: Ossom, E.M., N.S. Mavuso, and R.L. Rhykerd. 2011. Maize-sweetpotato intercropping influences on agronomic characteristics and soil chemical properties in Swaziland. Botswana Journal of Agriculture and Applied Sciences. (in press); Ossom, E.M., R.L. Rhykerd, and C.L. Rhykerd. 2010. Ecological Properties under Sunnhemp (Crotalaria juncea L.) Green Manuring of Sweetpotato (Ipomoea batatas (L.) Lam.) in Swaziland. American-Eurasian J. Agric. & Environ. Sci. 9:364-375.; Nxumalo, G.N., E.M. Ossom, R.L. Rhykerd, and C.L. Rhykerd. 2010. Alfalfa (Medicago sativa L.) Green manuring and ecological properties under corn (Zea mays L.) culture in Swaziland. Advances in Environmental Biology. 43:477-484.; Maganula, N.E.M., E.M. Ossom, R.L. Rhykerd, and C.L. Rhykerd. 2010. Effects of Chicken Manure on Soil Properties of Sweetpotato [Ipomoea batatas (L) Lam] Cultured in Swaziland. AEJA (in press); Ossom, E.M., R.L. Rhykerd, and C. Tfwala. 2010. Effects of Filter Cake Fertilization on Soil Chemical Properties and Cassava (Manihot esculenta Crantz) Yield in Swaziland. Research Journal of Agriculture and Biological Sciences 6(5): 600-606.; Mayisela, M.D., E.M. Ossom, and R.L. Rhykerd. 2010. Influence of different Groundnut (Arachis hypogea L.) populations on physiological growth indices and yields under intercropping with a fixed sweet potato [Ipomoea batatas (L.) Lam.] population. Journal of Applied Sciences Research. 6(2) 165-176.; Ossom, E.M. R.L. Rhykerd, and C. Tfwala. 2009. Influence of filter cake on agronomic characteristics of cassava (Manihot esculenta Crantz) in Swaziland. World Journal of Agriculture. 5(2):228-236.; Kuhlase, L.M., E.M. Ossom, and R.L. Rhykerd. 2009. Effects of Plant Populations on Morphological and Physiological Parameters of Intercropped Sweetpotato [Ipomoea batatas (L.) Lam. and groundnut (Arachis hypogea). Academic Journal of Plant Science. 2(1):16-24.; Ossom, E.M., L.M. Kuhlase, and R.L. Rhykerd. 2009. Effects of Plant Population on Yield Component and Yield of Intercropped Sweetpotato [Ipomoea batatas (L.) Lam. and Groundnut (Arachis hypogea). American-Eurasian Journal of Agronomy. 2(1):1-6.; Ossom, E.M., M.H. Nxumalo, F.M. Badejo, and R.L. Rhykerd. 2008. Preserving sweet potato [Ipomoea batatas L. (Lam.)] tubers under traditional storage methods in Swaziland. Tropical Agriculture. 85(2)161-169.; Ossom, E.M. and R.L. Rhykerd. 2008. Effects of lime on soil and tuber chemical properties and yield of sweet potato [Ipomoea batatas (L.) Lam.] in Swaziland. American-Eurasian Journal of Agronomy. Vol. 1(1)1-5.; Ossom, E.M. and R.L. Rhykerd. 2008. Implications of Associating Sweetpotato [Ipomoea batatas (L.) Lam.] with Different Groundnut (Arachis hypogea L.) Populations on Tuber Yield and Soil and Tuber Chemical Properties. Journal of Agriculture and Environmental Science 3(1):63-69.; Ossom, E.M., and R.L. Rhykerd. 2007. Effects of Lime on Weed Species Diversity and Yield of Sweet Potato [Ipomoea batatas (L.) Lam] in Swaziland. International Journal of Agriculture and Biology. 9(5): 755-758.; Ossom, E.M., and R.L. Rhykerd. 2007. Phaseolus vulgaris L. population density affects intercropped Ipomoea batatas (L.) Lam. Transactions of the Illinois State Academy of Science 100(1):13-23.; Rhykerd, R.L., E.M. Ossom, C. Nowak, and C.L. Rhykerd. 2007. Forming partnerships with overseas colleagues. Transactions of the Illinois State Academy of Science 100(1): 25-35; Ossom, E.M. and R.L. Rhykerd. 2007 Response of Ipomoea batatas L. (Lam.) to soil amended with filter cake. Transactions of the Illinois State Academy of Science. 100 (3 & 4):197-208.; Ossom, E.M., M.H. Nxumalo, and R.L. Rhykerd. 2006. Contributions of grain legume companion crops to sweet potato [Ipomoea batatas (L.) Lam.] ecological properties and yield in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology 9 (2): 149-158.; Ossom, E.M., S.T. Zwane, and R. L. Rhykerd. 2006. Plant population effects on ecological characteristics of field bean (Phaseolus vulgaris L.) in Swaziland. Transaction of the Illinois State Academy of Sciences. 99:1-15.; Ossom, E.M., M.H. Nxumalo, F.M. Badejo, and R.L. Rhykerd. 2005. Mineral concentration in sweet potato [Ipomoea batatas L. (Lam.)] tubers grown alone and intercropped with pulses and preserved under different methods. Tropical Agriculture 82(1):68-73.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Comparison of land equivalent ratio, yield and income from intercropping Ipomoea batatas (L.) Lam with pulses in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology. 8:(2)108-112.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Intercropping influences morphological development, weed suppression and yield of Ipomoea batatas (L.) Lam. UNISWA Research Journal of Agriculture, Science and Technology. 8(2):87-102.; Ossom, E.M., M. Nxumalo, and R.L. Rhykerd. 2005. Effects of intercropping pulses with Ipomoea batatas L. on plant mineral concentration and soil chemical properties in Swaziland. UNISWA Research Journal of Agriculture, Science and Technology 8(1):26-35.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, C.L. Rhykerd. 2003. Influence of mulch on soil temperature, nutrient content, yield component and storage root yield of Ipomoea batatas (L.) Lam. Indian Journal of Agricultural Sciences. 73:57-59.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, C.L. Rhykerd. 2003. Influence of mulch on soil temperature, nutrient content, growth and yield of sweet potato [Ipomoea batatas (L.) Lam.]. UNISWA Research Journal of Agriculture, Science and Technology, 6:137-146.; Ossom, E.M., P.F. Pace, R.L. Rhykerd, and C.L. Rhykerd. 2001. Effect of mulch on weed infestation, soil temperature, nutrient concentration, and tuber yield in Ipomoea batatas (L.) Lam. in Papua New Guinea. Tropical Agriculture 78:144-151.