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¹ Dr. Central Res. Inst. for freld Crops. Ankara Turkey
² Assoc. Prof. Univ. of Ankara, Faculty od Ag. Turkey - Various functional forms are ıısed to evolııate wheat yield response to fertilizer application in Easter Margin of Central Anatolia (EMCA). Resıılts indicate that any single model is superior, however, quadratic form seems to fit the data better and has some agronomic rational and economic easiness to interpret. Given the input - output price ratios, recommended application rates do not vary much. Farmers can be advised to use slightly more fertilizer than their current practices taking into account the agro- ecological characteristics of the region. A more general model including other variables to evaluate farmers data would yield more information for researchers and policy-makers. Keywords : Agro- ecological characteristics; wheat; yield