Effects of endomycorrhizas and phosphorus fertiliser on nodulation and acetylene reduction activity of white clover seedlings

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Abstract
Inoculation of white clover (Trifolium repens L.) with the mycorrhizal fungus Glomus tenuis (in the presence of Rhizobium trifolii) had no effect on nodule initiation over a wide range of soil phosphate levels. Acetylene reduction assays of seedlings 21–60-days-old showed that nitrogenase activity per unit plant phosphorus was the same in mycorrhizal and non-mycorrhizal seedlings. The results show that endomycorrhizal fungi do not directly affect nodule activity in white clover but merely improve the host plant's P nutrition in poor soils.