Abstract
Field and pot experiments were conducted to study the growth and uptake responses to Zn, Cu and Fe application in various rice cultivars to check their suitability to be grown in the deficient soils. In the 34 rice varieties grown without micronutrient applications in the field, leaf concentration of Zn ranged from 11.0 - 29.5, Cu from 3.5 - 9.5, Fe from 75 - 210 and Mn from 45 - 165 ppm showing a coefficient of variation as 21.8, 21.5, 27.9 and 37.9, respectively among the varieties. Both concentration and uptake of Zn, Cu and Fe in the shoots of 5 rice varieties grown in pots significantly varied in the presence and absence of their applications. Without Zn, Cu and Fe addition, Zn in shoots ranged from 13.3 - 14.9, Cu from 8.5 - 9.3 and Fe from 127 -198 ppm showing a difference in concentration among cultivars as 12.0, 9.4 and 55.8% which/increased on an average to 44.1, 30.7 and 22.5%, respectively with 5 ppm of their applications. Similarly, the difference in dry matter yield of cultivars grown with or without Zn, Cu and Fe was significant also showing differential nutrient requirements of cultivars. Moreover, the differential response or susceptibility to Zn, Cu and Fe deficiency did not seem to be associated with . any particular plant group nor the yield depresion with their deficiencies could be significantly correlated with Zn, Cu, Fe and P concentration in the plants of various rice cultivars .

M.Tahir, F.Hussain. (1990) DIFFERENTIAL UPTAKE AND GROWTH RESPONSE TO MICRONUTRIENTS IN VARIOUS RICE CUlTIVARS, , Volume 27, Issue 4.
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