Abstract

                                Cassava varieties, Burma and H. 165 were raised in a sandy loam soil under four levels of N aud K. Micronutrient contents of tuber, stem and leat were esti- mated in a ten month old crop. The results indicated that the concentration of ell the micronutrients in tuber, stem and leaf were not appreciably influenced by N and K fertilization. Leaf registered higher content of all the micronutrients except Zn. In tuber the concentration of Fe, Mn and Cu was the lowest and Zn was maximum. The variety H.165 had higher requiremont of all the four micronutrients than Burma. Nitrogen and Potash fertilization. had significantly increased the uptake of all the micronutrients. One hectare of tapioca crop yielding 33, 29 and 8 t/ha of tuber, stem and leaf respectively on fresh weight basis was found to remove. 2.76 Kg Fe. 805 Zn, 456 g Mn and 144 g Cu. The distribution of these nutriets in the plant indicated that more than fifty per cent of Zn had mobilised to the tuber while the stem retained a major po.tion of the absorbed Fe, Mn and Cu.

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