Eric John Hewitt FRS (27 February 1919–1 January 2002) was a British plant physiologist. He is commonly known for compiling the nutrient recipes for the Long Ashton Nutrient Solution in his landmark book on sand and water culture methods, first published in 1952Hewitt E. J. (1952). Sand and Water Culture Methods Used in the Study of Plant Nutrition. Farnham Royal, England: Commonwealth Agricultural Bureaux, pp. 241. Technical Communication No. 22 of the Commonwealth Bureau of Horticulture and Plantation Crops. and revised in 1966.Hewitt E. J. (1966). Sand and Water Culture Methods Used in the Study of Plant Nutrition. Farnham Royal, England: Commonwealth Agricultural Bureaux, pp. 547. Technical Communication No. 22 (Revised 2nd Edition) of the Commonwealth Bureau of Horticulture and Plantation Crops.
