Reid's research is primarily in the area of improving the efficiency of fertilizer and limes for agricultural production and environmental protection. The N contributions from green manures, such as alfalfa sods to subsequent corn crops in New York and in the tropics, has been eventful. For example, an alfalfa sod can supply adequate N to produce a 150 bu/a corn crop the year a sod is plowed. The N contribution decreases to 50-70 pounds/acre in the second year, and 20-40 pounds/acre in the third year.

He has the major responsibility, in cooperation with other faculty and staff, for developing fertilizer and lime recommendations for field crops in New York State. He maintains contact and provides information to the Lime and Fertilizer industry.