Effect of time of iodine fertilization on effectiveness of agronomic fortification of cassava in calabar, south-eastern nigeria

Ansa J.E.O., Binang W.B and Shiyam J.O

The experiment was conducted in CalabarSouth-eastern Nigeria to ascertain the appropriate time of iodine application for effective agronomic iodine biofortification of cassava in two varieties of cassava (TME 419 and TMS 30555) fertilized with 2.5kg/ha potassium iodine (KI) at 8, 10 and 12 weeks after planting (WAP). Parameters measured were plant height, number of leaves, number of stem, leaf area (LA), leaf area index (LAI) and iodine content in tuber flesh and processed cassava products. Results showed that time of iodine application did not significantly affect plant height, number of stems, number of leaves LA, and LAI (P>0.05); tuber number weight and plot yield were not significantly influenced by time of iodine application (P>0.05), TME 419 retained higher levels of iodine in tuber flesh when iodine was applied at 8 weeks after planting, at 12WAP TMS 30555 recorded its highest value of retained iodine. Iodine applied at 12WAP translated to higher levels of iodine retained in processed cassava of the two varieties. Application of iodine at 12WAP is recommended for effective agronomic bio fortification.

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