File:Aluminium toxocity maize roots 2017 01 05 6161.jpg

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English: Maize roots affected by aluminium toxicity. Aluminium (Al) toxicity is the most important soil-acidity related disorder affecting maize in highly weathered acid soils in the tropics and subtropics. The primary effect of Al toxicity is the reduction of root growth; roots are often malformed, thickened and stubby.

As a result of the poor root growth, secondary effects are:

  • small plant size and low crop yield;
  • strong competition from acid-tolerant weeds
  • wilting (water stress) as roots are unable to take up sufficient water;
  • phosphorus-deficiency symptoms (good root growth is critical for P uptake, especially in these low-P soils);
  • nitrogen-deficiency symptoms (nitrate is often rapidly leached to below the poor root system and acid-tolerant weeds compete strongly for plant-available N);
  • and magnesium-deficiency symptoms (acid soils often have low Mg reserves, and Al toxicity reduces plant uptake of Mg).
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Author Alandmanson

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current08:03, 14 May 2017Thumbnail for version as of 08:03, 14 May 20172,062 × 1,068 (1.06 MB)Alandmanson (talk | contribs)User created page with UploadWizard

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