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  • H 79 Managing White Clover Desiccation In Challenging Seasons

H78 Managing white clover desiccation in challenging seasons

250120 Bulky white clover

This update outlines the results of five years of trials exploring pre-desiccant options for managing bulky white clover crops, aiming to reduce rapid leaf regrowth following diquat desiccation under wet or high-fertility conditions. Achieving effective desiccation required balancing this process with post-harvest regrowth, as clover seed crops are often used for lamb grazing on New Zealand cropping farms.

Key points

  • Growers rely on diquat (Reglone®, Group 22) as a white clover desiccant, but when crop biomass is high, e.g. in wetter seasons, regrowth can collapse the canopy and reduce seed yield.
  • Herbicides glufosinate-ammonium, glyphosate, tribenuron, and clopyralid were also as effective as MCPA as pre-desiccants prior to diquat application.
  • However, these herbicides also reduced post-harvest regrowth by between 46 to 99 %, compromising post-harvest grazing.
  • Seed germination was not affected by any desiccants.

Read full document here

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