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Nature of the inorganic fraction of soil phosphate fed on by vesicular-arbuscular mycorrhizae of potatoes

  • K Swaminathan
Article

Abstract

Three latosols that fix applied soluble phosphate most avidly were dressed with labelled single superphosphate and potato plants were grown on them, with or without artificial inoculation with spores of endomycorrhizae. Mycorrhizal plants were found to accumulate more phosphate, especially from the ferruginous Ootacamund soil, which has the strongest affinity for phosphate. Fractional chemical and radio-chemical analyses of the soils, before and after the plant culture, together with other available evidences, point to the conclusion that the endophyte can attack and mobilise such fractions of phosphate in latosols that are least available to potato plants. Further confirmation for this conclusion came from a sand culture experiment, in which mycorrhizal and non-mycorrhizal potato plants were either dressed with labelled AIPO4 and FePO4, or fed with saturated solutions thereof; it was found that, in the former case, plant uptake was much larger although the specific activities remained unchanged.

Keywords

Vesicular-arbuscular mycorrhizae potatoes soil phosphate aluminium phosphate iron phosphate 

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Copyright information

© Indian Academy of Sciences 1979

Authors and Affiliations

  • K Swaminathan
    • 1
  1. 1.Central Potato Research InstituteSimla

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