Constantine Campbell is a Canadian scientist who is a researcher in soil organic matter and all features of nitrogen in soils and crops. Campbell is the leading authority on soil fertility and degradation of nitrogen in American prairie soil, which includes the amount of loss on the quality of organic matter. He was one of the first to radiocarbon date soil organic matter, and in 1967 published a paper which is cited as a landmark work. Majority of his career, he worked with Agriculture Canada in Swift Current, Saskatchewan, retiring in 1998.
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