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Addis Ababa agroforestry animal traction anthelmintics application average bullock farming bullock households bullock traction cereals cited by Duthie clover coefficient of variation crop production crop yields cultivated area Duthie and Keen East African Agricultural economic Effects of phosphate Egyptian rock phosphate Ethiopia farmers farming systems fertilizers fodder forage germplasm hand-hoe technology hectare helminths hoe and bullock household income household member ILCA BULLETIN ILCA's increase Kenya kg DM kg ha1 kg P2O5 land legumes leguminous trees livestock maize man-equivalent ME-h Minjingu rock phosphate minth n.a. TRP Napier grass nematode northeast Ghana northern Ghana Panin phate phosphate rocks planted quartinianum on Vertisol rainy season refined phosphates relative agronomic effectiveness Research residual effects response ridging rock and refined rock phosphate semi-arid zone sheep sodaphosphate soil sources species steudneri subhumid Tanzania tion trials triple superphosphate TSP/ERP Uganda Vertisols Veterinary