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Hellriegel, back in 1886, made the incidental discovery that leguminous plants fixate nitrogen, and, hence, our fields of clover, alfalfa, cow-peas, and soybeans.
Sir Humphrey Davy, Baron von Liebig, Lawes and Gilbert, and Hellriegel followed DeSaussure and completely filled the nineteenth century with accumulated scientific facts relating to soils and plant growth.
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