This text is a product of a research work, which was intended to verify the compatibility as well as the workability potential of the Keynesian model. The Keynesian model is an economic growth model, which sort to integrate the Government in a country into the economic growth model through Public expenditure of the government which can be in any form aimed at improving the welfare, as well as the economic and social status of the people at large. According to the findings of this research, it is evident that the Government is a major actor in the economic growth of a country. The research taking into account the government spending on agriculture in Nigeria showed that as the government spending on agriculture increased over the years, all things being equal, output also increases.