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Objective: To assess the response of new registered Kiroba cassava variety on different rates of fertilizer under rainfed and irrigated regimes on the low fertility land of Tanzania Agricultural Research Institute of Tanzania (TARI), Ukiriguru, Mwanza, Tanzania. Methods: The experiment was laid in a randomized complete block design in a split-plot design with irrigation and rainfed regimes being the site-main plot and fertilizer-subplots replicated three times. The treatments were absolute control and three rates i.e., 150:40:180, 75:20:90 and 300:80:360 kg ha-1 of N, P, and K respectively, under the rainfed and irrigated regimes. Results: Half rate of fertilizer blend N75P20K90 under irrigation regime had significantly high root storage yields ranging from 24.76 to 25.21t ha-1, to both cropping seasons. However, even though the root storage yields were slightly low (24.59 to 24.14t ha-1) in the same treatment, it did not differ with the rainfed treatment. The high root storage yields were attributed to the narrow gap between the small and large storage root size and adequate moisture levels. Conclusion: Cassava crop requires less fertilizer nutrients, but with appropriate proportion on soil moisture for increased root storage yield. Therefore, the study recommends further research to determine the potential yields using fertilizer blend within N50P10K70 and N100P30K120. |
