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Ncube, B and Dimes, J P and Twomlow, S J and Mupangwa, W and Giller, K E (2007) Raising the productivity of smallholder farms under semi-arid conditions by use of small doses of manure and nitrogen: a case of participatory research. Nutrient Cycling in Agroecosystems, 77 (1). pp. 53-67. ISSN 1385-1314