Homer Dwight Chapman

Homer Dwight Chapman (also Homer D. Chapman , born October 4, 1898 in Darlington , Lafayette County , Wisconsin , † April 4, 2005 in Irvine , Orange County , California ) was an American agronomist and soil scientist .

Life

Family and education

Originally from Darlington , Wisconsin, Homer Dwight Chapman, descendant of English immigrants, son of Faithful William Chapman (1856-1938) and his wife Finetta Merriam Chapman (1857-1961), turned after completing compulsory schooling, followed by participation in World War I. to study agricultural sciences at the University of Wisconsin – Madison , where he earned a Bachelor of Science in 1923, a Master of Science in 1925 and a Ph. D. in Soil Science in 1927 .

Homer Dwight Chapman, a member of the Presbyterian Church , married on March 10, 1925 in Riverside Daisy Ernst (1902-1999). He died in the spring of 2005 at the age of 106 in Regents Point Retirement Home in Irvine.

Professional background

After Homer Dwight Chapman had filled a position as Assistant in Soils at the University of Wisconsin-Madison , after graduating he moved to the University of California Citrus Experiment Station in Riverside, which was incorporated into UC Riverside in 1954, and in 1937 he became an Associate Chemist , 1944 promoted to chemist . In 1938 he was appointed Professor of Soils and Plant Nutrition , in the same year he was appointed head of the Department of Agricultural Chemistry , later renamed the Department of Soils and Plant Nutrition . He also served as the Acting Director of the Citrus Experiment Station in 1951 and 1952 . Homer Dwight Chapman retired in 1961 .

Chapman also acted as a delegate at the 13th International Horticultural Congress in London in 1952, and at the Second Pan American Congress on Agronomy in São Paulo in 1954 . In 1956 and 1957, Chapman worked as a Specialist in Soils for a project sponsored by the United States Agency for International Development in Chile . In 1952 he traveled to the Mediterranean region to study , and in 1957 to South Africa and Japan . Visiting professorships took him to the Indian Agricultural Research Institute in New Delhi in 1961 and 1962 , and to the University of Alexandria in 1964 and 1974. In 1968 Chapman organized the First International Citrus Symposium , held in Riverside. The success of this event led to the founding of the International Society of Citriculture in 1970 , of which he was later made an honorary member .

Homer Dwight Chapman, who holds fellowships in the American Association for the Advancement of Science , the American Society of Agronomy, memberships in the International Union of Soil Sciences , the American Chemical Society , the Soil Science Society of America, the American Society for Horticultural Science , of the Western Society of Soil Science, which held Sigma Xi , Phi Lambda Upsilon, Gamma Alpha, Phi Sigma and Alpha Gamma Rho, distinguished themselves in particular through research results relating to the use of fertilizers for the cultivation of citrus fruits. In 1969 he was awarded an honorary doctorate by UC Riverside for his life's work .

Fonts

• The influence of soil acidity, total calcium, and liming upon the calcium content of some important agricultural crops, Thesis (MS), University of Wisconsin - Madison, Madison, Wis., 1925
• Available calcium in soils, its importance and its determination, Thesis (Ph. D.), University of Wisconsin - Madison, Madison, Wis., 1927
• with Walter Pearson Kelley: The determination of the replaceable bases and the base-exchange capacity of soils, New Brunswick, NJ, 1930
• Studies on the blue colorimetric method for the determination of phosphorus, New Brunswick, NJ, 1932
• The phosphate of southern California soils in relation to citrus fertilization, in: Bulletin (California Agricultural Experiment Station), 571, Agricultural Experiment Station, Berkeley, Calif., 1934
• together with George Friedrich Liebig: Nitrate concentration and ion balance in relation to citrus nutrition, in: Hilgardia, vol. 13, no. 4., University of California, Berkeley, Calif., 1940
• together with Samuel Melvin Brown, DS Rayner: Effects of potash deficiency and excess on orange trees, in: Hilgardia, vol. 17, no. 19., University of California, Berkeley, Calif., 1940
• Leaf and soil analysis in citrus orchards: criteria for diagnosis of nutrient status and guidance of fertilization and soil management practices, in: Manual (California Agricultural Experiment Station), 25., University of California, Division of Agricultural Sciences, Agricultural Experiment Station-Extension Service, Berkeley, Calif., 1960
• with Parker F. Pratt: Methods of analysis for soils, plants, and waters, Division of Agricultural Sciences, University of California, Berkeley, Calif., 1961
• Diagnostic criteria for plants and soils, University of California Press, Berkeley, Calif., 1966
• Walter Pearson Kelley: February 19, 1878-May 19, 1965, in: Biographical memoirs, v. 40, no.7, Columbia University Press, New York, 1969

literature

• William Haynes (Ed.): The Chemical Who's Who, Volume II, Lewis Historical Publishing Company, New Haven, Conn., 1937, p. 89.
• William Haynes (Ed.): The Chemical Who's Who, Volume III, Lewis Historical Publishing Company, New Haven, Conn., 1951, p. 129.
• University of California (System): University Bulletin: A Weekly Bulletin for the Staff of the University of California, Volume I-II, Office of Official Publications, University of California, Berkeley, Calif., 1952, p. 94.
• Leaders in American Science, Who's Who in American Education, Nashville, Tenn., 1963, p. 115.
• Robert Cecil Cook: Who's Who in American education (first volume - three volume series): a biographical directory of eminent living university and college professors, superintendents and principals of schools, state and national school officials, librarians and miscellaneous educators, Who's Who in American Education, Hattiesburg, Miss., 1968, p. 141.
• Walter Reuther (Ed.): The Citrus Industry, Volume V: Crop Protection, Postharvest Technology, and Early History of Citrus Research in California, Agriculture & Natural Resources, Oakland, Calif., June 1989, p. 344.
• Who was who in America: with world notables: Volume X, 1989-1993, Marquis Who's Who, New Providence, NJ, 1993, p. 62.

Web links

• Homer Dwight Chapman in the database of Find a Grave (English)
• Literature by and about Homer Dwight Chapman in the WorldCat bibliographic database
• Dennis McLellan, “Homer D. Chapman, 106; Expert in Soils, Care and Feeding of Citrus " , Los Angeles Times , April 9, 2005; Retrieved November 1, 2013.