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김석동 한국콩연구회 1989 韓國콩硏究會誌 Vol.6 No.2
Symbiotic N₂ fixation in legumes is the culmination of a complex interaction involving host, Rhizobium and environment. Success in obtaining high N₂ fixation by the Rhizobium-legume symbiosis depends on a series of interacting factors: (a)effectiveness and efficiency of the Rhizobium strains present in the inoculum and/or soil in relation to the species and varieties of the legume; (b)competitive ability of the introduced rhizobia in relation to the native rhizobial population; (c)ability of the hose to supply its microsymbiont's nutritional needs; and (d)environmental factors, especially limiting factors in soil, that act an the bacteria and the host. The environment may directly affect the rhizobia or indirectly influence the bacteria through the plant. Fortunately, most of the conditions that benefit the bacteria and enhance N₂ fixation will also be beneficial to the plant, and when conditions are optimums for the: nutrition. The more important and common limiting factors in sail for N₂ fixation are P, Mo and lime deficiency, soil acidity, and toxic levels of exchangeable Al and Mn. The overcoming of these stresses is essential for high N₂ fixation and high yield. Of the many limiting factors, P deficiency is the most important single limiting fatter for N₂ fixation and soybean production. It has been shown that plants dependent on N₂ require more P than plants using mineral N. This need reflects the vital role of P in energy transfer and the large quantity of energy required for the reduction of N₂ to NH₃.
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