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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Effect of Postemergence Supplemental Inoculation on Nodulation and Symbiotic Performance of Soybean (Glycine max (L.) Merrill) at Three Levels of Soil Nitrogen
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Effect of Postemergence Supplemental Inoculation on Nodulation and Symbiotic Performance of Soybean (Glycine max (L.) Merrill) at Three Levels of Soil Nitrogen

机译：三种土壤氮素水平下出苗补充接种对大豆根瘤和共生性能的影响

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摘要

The influence of a supplementary bradyrhizobial inoculation after an initial seed slurry inoculation with the same strain on nodulation and N2 fixation in soybeans was examined in the greenhouse. The plants were grown in a Typic Eutrocrepts soil: sand mixture containing 25, 65, or 83 mg of N per kg (i.e., native soil N plus 15N-labeled ammonium sulfate). Harvests were made at early flowering and physiological maturity. The supplementary inoculations which were made 14 or 21 days after planting (DAP) caused formation of substantially more nodules than the single slurry inoculation did. Autoregulation was therefore not completely successful in preventing subsequent infections. For the slurry-inoculated plants, at both harvests the proportion of N derived from fixation was greatest in the soil containing the least N, and only slight increases in N2 fixation resulted from a second inoculation. The inhibition of N2 fixation at the higher N levels was significantly reduced by a second inoculation at 21 DAP; this treatment resulted in at least a doubling of both the percentage and total amount of N2 fixed by the single slurry inoculation at physiological maturity. The N2 fixation increases resulting from the supplementary inoculation at 14 DAP were less pronounced and not significant. Greater N2 fixation was frequently not reflected by increased total N or dry matter yield, suggesting that the major benefit of the increased fixation was a decreased dependence of plants on soil N for growth.
机译：在温室中，检查了用相同菌株接种初始种子浆后接种补充根瘤菌对大豆结瘤和固氮的影响。这些植物生长在典型的Eutrocrepts土质土壤中：每公斤含25、65或83 mg N的沙子混合物（即天然土壤N加 15 N标记的硫酸铵）。在早期开花和生理成熟时收获。种植后14或21天（DAP）进行的补充接种导致形成的结节比单浆液接种要多得多。因此，自动调节不能完全成功地预防随后的感染。对于用泥浆接种的植物，在两次收获时，固着来源的N的比例在含氮最少的土壤中最大，而第二次接种只会使N2固定的增加很小。通过在21 DAP进行第二次接种，可以显着降低较高N水平下对N2固定的抑制作用。这种处理导致在生理成熟时单次接种泥浆固定的N2的百分比和总量至少翻倍。 14 DAP补充接种导致的N2固定增加不明显，也不明显。总氮或干物质产量的增加通常无法反映出更高的固氮能力，这表明固氮能力提高的主要好处是植物对土壤氮生长的依赖性降低。

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