Yuma, Chansa The impact of the introduction of Chingovwa (improved sweet potato cultivars) on the local cultivars in Ndola district. / by Chansa Yuma - Kitwe : Copperbelt University, 2012 - ix, 47 pages : illustrations Subjects--Topical Terms: SWEET POTATOES - VARIETIES - AFRICA, SUB-SAHARAN ROOT CROPS FOOD CROP DIVERSIFICATION--ZAMBIA LC Class. No.: CBU-UG THESIS/YUM