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    <subfield code="a">Hopkins, Cyril G.</subfield>
    <subfield code="q">(Cyril George),</subfield>
    <subfield code="d">1866-1919</subfield>
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    <subfield code="a">Nitrogen Bacteria and Legumes :</subfield>
    <subfield code="b">With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils</subfield>
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    <subfield code="c">2018</subfield>
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    <subfield code="a">University of Illinois Agricultural Experiment Station Bulletin No. 94</subfield>
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    <subfield code="a">Release date is 2018-01-31</subfield>
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    <subfield code="a">Produced by Bryan Ness, Jana Srna and the Online Distributed
Proofreading Team at http://www.pgdp.net (This file was
produced from images generously made available by The
Internet Archive/American Libraries.)</subfield>
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    <subfield code="a">"Nitrogen Bacteria and Legumes" by Cyril G. Hopkins is a scientific publication written in the early 20th century, specifically in 1904. This book delves into the essential relationship between nitrogen-fixing bacteria and leguminous plants, particularly focusing on crops such as red clover, cowpeas, soybeans, alfalfa, and sweet clover and their interactions within Illinois soils. The author embarks on an exploration of how these bacteria contribute to agricultural productivity via nitrogen fixation, which is crucial for the growth of many crops.  In this comprehensive bulletin, Hopkins discusses the roles of different species of nitrogen-gathering bacteria and their specific associations with various legumes. He highlights how these bacteria must be present in the soil for legumes to effectively utilize atmospheric nitrogen, stressing the importance of inoculation when planting legumes on new or previously unfarmed land. Through a series of observations and experiments, Hopkins illustrates the necessity of these bacteria for successful crop cultivation, providing practical advice for farmers on improving soil nitrogen levels and agricultural sustainability. The findings suggest that understanding and managing soil bacteria are vital for optimizing legume production and, consequently, maintaining soil fertility. (This is an automatically generated summary.)</subfield>
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    <subfield code="a">Nitrogen-fixing microorganisms</subfield>
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