THE relation of nitrogen fixation to nodulation is not yet well understood. Nodule position, nodule size, haemogoblin content and longevity of nodule tissues have been taken into consideration1,2. Chen and Thornton3 showed, from considerations of the structure of effective and ineffective nodules of clover, pea and soybean, that differences in efficiency of nitrogen fixation were due to the volume of active bacterial tissue. Bowen4 found a highly significant regression of dry weight of plants with nodule weight in Centrosema pubescens, inoculated with seventeen different Rhizobium strains. He suggested that Rhizobium strains have the same nitrogen fixing ability weight for weight of nodule tissue, and that differences in effectiveness resulted from the different amounts of nodule tissue formed.
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Döbereiner, J., Plant and Soil (in the press).
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DÖBEREINER, J. Evaluation of Nitrogen Fixation in Legumes by the Regression of Total Plant Nitrogen with Nodule Weight. Nature 210, 850–852 (1966). https://doi.org/10.1038/210850a0
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