The effect of energy on the use of conservation tillage is of special importance in addressing concerns about the impact of agricultural production on the environment in the United States. After establishing that a relationship exists between the price of energy and the use of conservation tillage via Granger causality, the relationship is quantified. It is shown that while the real price of energy does not affect the rate of adoption of conservation tillage, it does impact the extent to which it is used. Finally, there is no structural instability in the relationship between the relative use of conservation tillage and the real price of energy over the period 1963-1997.