The study assessed the effectiveness of federal government agricultural expenditure policies in Nigeria and the implications of these policies from 1960–2007. Secondary data which covered the country were used to achieve the objective. Tin Bergin model was employed to ascertain the effectiveness of federal government agricultural expenditure policy. The study revealed that public expenditure policy on agriculture in Nigeria was generally ineffective, contributing a marginal increase of 0.04 percent to agricultural output from every 10 percent increase in agricultural expenditure. This result agree with the hypothesis of this study, which stated that agricultural expenditure policies relating to Federal Government direct spending have not been effective in achieving increased agricultural productivity in Nigeria.