C.M. Githunguri, J.A Chweya, I.J. Ekanayake & A.G.O. Dixon
Cassava roots provide a cheap source of dietary energy. Variations in yield, root cyanogenic potential (RCNP), leaf water potential (LWP), and leaf area duration (LAD) occur due to various factors. This makes selection of clones with wide ecological adaptation and high yield difficult. The influence of crop age and agroecozones (AEZ) on above parameters of cassava were studied in Nigeria. The tested AEZs were Sudan savanna (Minjibir), southern Guinea savanna (Mokwa) and forest-savanna transition (Ibadan). Results suggest that root development was restricted by low moisture stress. The highest yield was obtained at 8 months after planting at Mokwa. RCNP increased with age and changed with location. The lowest and highest RCNP and LWP were recorded in wet (Ibadan) and drier (Minjibir) regions and during drought and rains, respectively. The sites had a similar LAD. Close relationships were obtained for root yield and LAD, RCNP, LWP and between RCNP and LAD.